Five Mesh VPN Solutions for SMBs: Comparison and Practical Guide

Introduction

With the widespread adoption of remote work and the growing outsourcing of services, SMBs face new challenges in cybersecurity and access management. Employees must be able to connect to company resources from anywhere while keeping critical systems secure. Yet multiplying direct access points or traditional VPNs in a disorganized way can create access fragmentation: each service has its own portal, its own credentials, even its own VPN, making management complex and increasing the risk of breaches. It is therefore crucial to streamline these connections within a unified, secure framework.

A mesh-type virtual private network, also called an overlay network, addresses these challenges by connecting all of the company's authorized devices to one another within an encrypted, private network laid over the Internet. Unlike traditional hub-and-spoke VPNs (with a central server that all clients connect to), a mesh VPN allows direct peer-to-peer connections between machines. In concrete terms, this means that the company's computers, servers and remote devices can communicate with each other as if they were on the same local network, wherever they happen to be physically located. The result: smoother access to internal tools, less reliance on a central point (better performance, no single bottleneck) and centralized administration of security rules.

What's more, these private networks make it easier to apply the principle of least privilege and a "Zero Trust" approach tailored to SMBs. You no longer blindly trust every device present on the network: each connection to a sensitive resource can be restricted through ACLs (Access Control Lists) and isolated network segments. Even inside the VPN, you segment who can access what. This prevents, for example, a compromised employee or device from reaching data that doesn't concern it. Separating access and finely defining permissions reduces the risk of an attacker moving laterally through the information system.

In this context, it becomes imperative to restrict access to the company's critical services to these secure private connections only. Rather than exposing a password manager, a database or an intranet server directly on the Internet (even behind a strong password), you access it only when connected to the company's private network. That way, an attacker can't even reach the login page of these services without first breaching the VPN defenses — which adds a considerable layer of protection.

Finally, the Quebec context brings a few additional considerations. The new Law 25 requires companies to better protect personal information and to assess risk when data leaves Quebec or Canada.

More and more SMBs are therefore taking an interest in digital sovereignty, that is, control over their own data and infrastructure. Choosing mesh VPN solutions, particularly self-hosted open source tools, can help retain greater control (for example by hosting the VPN's coordination server in Canada or within the company itself). Conversely, relying on a commercial cloud VPN service managed abroad can raise questions of compliance and trust. The goal is to strike the right balance between ease of use, security, data control and cost, according to the realities of each SMB.

In this article, we will compare five overlay network (mesh VPN) solutions suited to SMBs, with an emphasis on secure remote work and the protection of critical systems. Three of these solutions are free, open source tools that you can host yourself: WireGuard, Nebula and ZeroTier (in self-hosted mode). The other two are commercial cloud solutions where the infrastructure is managed by the provider: Tailscale and ZeroTier Central (ZeroTier's official cloud service). We will first explain, in accessible terms, what mesh VPNs are good for and the security concepts involved (ACLs, segmentation, etc.), then present each solution with its operating characteristics, ease of deployment, the control it offers, costs and maturity. Concrete use cases will illustrate how an SMB can put these technologies to work day to day. Finally, a Recommendations section will help you choose the solution best suited to your organization's size, sector and needs.

Why a mesh VPN for SMBs?

For an SMB, deploying a mesh VPN offers several concrete advantages, particularly in a remote-work or multi-site context:

• Unified, seamless access to internal resources: With an overlay network, all authorized employees and devices are linked as if they were on the same LAN (local network). For example, while working remotely, an employee can reach the office file server, the intranet or the internal management application without complex configuration — they connect to the VPN and see these resources directly, without going through separate tunnels for each service. This simplifies the user experience and boosts productivity, since you avoid technical fiddling every time you use a company tool.
• Better performance thanks to peer-to-peer: In a traditional hub-and-spoke VPN, a central server handles all traffic — which can create a bottleneck, especially if many employees connect at the same time or if the server has limited bandwidth. By contrast, a mesh VPN lets devices communicate directly with one another whenever possible. For example, if two remote colleagues need to exchange a large file, their traffic can go straight from one to the other instead of routing through the company headquarters. The mesh network generally uses advanced NAT traversal techniques to establish these direct connections across the Internet, even if the devices sit behind strict routers or firewalls. The result: improved throughput and lower latency, which is welcome for uses such as video conferencing, IP telephony, or simply faster access to internal databases and applications.
• No single point of failure: If the central VPN server goes down in a traditional setup, nobody can do anything remotely anymore. In a peer-to-peer overlay network, the unavailability of one node — or even of a coordination server — does not necessarily prevent the other nodes from communicating (depending on the architecture). This improves the resilience of access to the information system. Each device acts, in a sense, as part of the overall network, without permanently depending on a single hub.
• Stronger security through compartmentalization: A mesh VPN provides fertile ground for applying network micro-segmentation principles. Since all communication passes through the encrypted private network, you can more easily control and log who accesses what. You also avoid having critical services reachable from the Internet. Instead, they are hidden behind the VPN. For example, a sensitive admin interface or an internal Git repository would only be accessible to authorized devices that are members of the VPN, and invisible to the rest of the world. In addition, modern overlay VPN solutions often let you define granular access rules (by user, by device, by group, etc.) within the private network itself, which adds a layer of control compared to the simple "all or nothing" VPN of the past.
• Ease of connection for users: For the non-technical employee, these solutions can be very simple to use. Many overlay solutions offer client applications that are easy to install on a PC or smartphone, with single sign-on (for example, through the company account), and then everything works in the background. No more manual OpenVPN configurations or complex key sharing: the user connects in a few clicks and can simply get on with their work, which reduces friction in complying with security policies. A well-chosen solution can even let a new employee get up and running quickly (you add them to the system and their access to the resources they need is automatically ready through the mesh VPN).

In short, a mesh VPN can be seen as an invisible backbone securely linking all of the company's people and equipment. It is especially useful for SMBs doing hybrid remote work (some staff at the office, others remote), for those with several geographic sites, or for those that regularly call on external contractors needing access to certain internal applications. Rather than juggling many one-off connection solutions, the overlay network acts as a single foundation onto which all uses are plugged in.

Internal access control and security: ACLs, segmentation and critical services

Setting up a mesh virtual private network isn't just a matter of practical connectivity — it's also an opportunity to raise the company's internal security. Here are a few key concepts to understand, presented simply

• ACLs (Access Control Lists): Think of ACLs as lists of rules that determine who is allowed to access what. In the context of an overlay VPN, an ACL might, for example, state that these users or devices on the private network are allowed to connect to that resource or service, possibly under certain conditions (time, location, etc.). In practice, this could mean: "Only computers in the Accounting department may access the payroll server" or "Deny everyone except the network administrator access to the router's admin interface." ACLs therefore let you fine-tune the security policy within the VPN itself, beyond simply connecting or not. It's a bit like a physical access control system: everyone can enter the building with a general badge (connecting to the VPN), but certain doors inside only open for authorized people (internal ACLs).
• Internal network segmentation: Segmentation (or "access separation") consists of dividing the network into several zones or isolated segments separated from one another, in order to limit the reach of a potential intrusion. Instead of a flat corporate network where, once connected, you can theoretically reach any machine, you create subnets or groups. For example, you can isolate the production server network, the IoT equipment network, and the client workstation network. With a modern mesh VPN, this segmentation can be logical — based on the identity of the device or user — rather than only physical or IP-based. This ties in with the ACL principle: you grant access only to the segment that's needed. In the event a workstation is compromised, the attacker won't be able to easily bounce across the whole infrastructure, because the "doors" between segments are closed by default. Internal segmentation is fundamental to protecting critical systems.
• Access to critical services reserved to the VPN: Many SMBs have highly sensitive services: for example a corporate password vault, a management server (ERP/CRM), a customer database, an industrial control system, and so on. Ideally these services should never be directly accessible from the Internet, even behind a login. By placing them behind the private VPN, you add a barrier. Only users connected to the VPN and duly authenticated can even attempt to reach them. You drastically reduce the attack surface: no more risk that a bot on the Internet stumbles by chance on your login page and tries millions of passwords, or that an unpatched vulnerability in your application is exploited remotely. Access becomes a privilege, not a right granted to anyone with an Internet connection. It's a bit like keeping the family jewels in a safe accessed from a secure room, rather than leaving them in the entryway of the house.
• Logging and audits: An often-underrated advantage of overlay VPNs is that they can centralize access logging. Because connections pass through this controlled network, it's possible to know which user accessed which resource and when. Some solutions provide detailed logs or can be integrated with auditing and monitoring tools. For an SMB that wants to comply with security standards or with Law 25, being able to trace access to sensitive data is a real asset. For example, if a security audit asks you to prove that only authorized people consult the database containing personal information, an infrastructure where everything passes through the mesh VPN (and is therefore potentially recorded) makes that kind of verification easier.

All in all, setting up a mesh VPN doesn't just make remote work more convenient: it's also a lever for instilling a more robust internal security culture. You move from an old model where simply being "on the company network" was enough to be trusted, to a modern model where every access is controlled, every critical resource is isolated behind several layers, and where you assume the threat can also come from inside or from compromised devices. For an SMB, these principles may seem technical, but the tools we present further on make them accessible in practice, often through simple interfaces for defining rules or through the initial configuration of the private network.

Concrete use cases for SMBs

To illustrate clearly what these technologies bring, here are a few typical use cases where an SMB can take advantage of a secure overlay network:

• Secure access to an intranet or internal applications: Imagine an SMB that has an intranet (for example, an internal website for employees containing the staff directory, procedures, HR documents, etc.) or even a network file share. By deploying a mesh VPN, the SMB can make that intranet accessible from anywhere only to employees connected through the private network. An employee on the road or working remotely launches their mesh VPN client and can consult the intranet exactly as if they were at the office. The company doesn't need to expose the intranet on the public Internet, which avoids any external hacking attempt. Moreover, thanks to ACLs, you could restrict certain sensitive sections of the intranet to specific user groups (for example, the "Accounting" folder accessible only to accountants even within the VPN).
• Centralizing access to a password manager: Corporate password managers (e.g. self-hosted Bitwarden, a shared KeePass, or an in-house solution) hold the "keys to the kingdom." It's dangerous to make them accessible from just any Internet connection, even protected by a master password. With an overlay VPN, the SMB can host its password vault on an internal server and require that, to access it, the user be connected to the secure VPN. That way, an employee who needs to retrieve a password does so from the protected environment of the private network, reducing the risk of interception. You can log these accesses and limit them (e.g. only members of the IT team can access the vault of admin accounts, etc.). This provides a double barrier: an attacker would have to compromise both the VPN and the password manager to reach this critical data.
• Simplified hybrid remote work: In many SMBs, remote work isn't all-or-nothing — it's hybrid (a few days at home, a few days at the office). With a mesh VPN solution, the transition is seamless. At the office, the machine can reach resources directly (or even through the VPN, which is no problem), and at home the employee turns on their VPN client and finds exactly the same network environment. For example, a developer working on an internal test server doesn't need to change their tool's configuration depending on whether they're at the office or at home: the server's private IP address remains reachable in both cases through the VPN. This reduces the risk of misconfiguration or of leaving ports open "to test from home" (common bad practices when there's no unified VPN).
• Audit and technical support access: An SMB may have external contractors or auditors who need temporary access to certain machines or logs. Rather than opening up a traditional VPN access to the entire network (which raises a trust concern) or asking them to come on-site, you can add them to the overlay network with a restricted profile. For example, a security expert engaged for an audit could be invited onto the company's mesh VPN, but you configure ACLs so that they can only query the servers targeted by the audit, and nothing else. You can limit the duration of their access (by removing them from the VPN once the engagement is over). This way, the auditor can work from home, connecting to the SMB's machines securely, without publicly exposing those machines or giving them an overly broad VPN key. Likewise, for outsourced technical support, you can grant technicians VPN access to just the systems concerned (e.g. the mail server only, and nothing else).
• Interconnecting geographic sites: If an SMB has two or more offices (for example, a headquarters in Montreal and a branch in Quebec City), a mesh VPN can replace or complement costly inter-site links. Each site connects its router or a few key machines to the overlay network, which creates a shared encrypted network over the Internet. Employees at both sites can access shared resources without distinction, and the two local networks can be linked as a single virtual network. This is often done without having to manually configure complicated site-to-site tunnels: mesh solutions handle the discovery and automatic connection of the corresponding nodes. As a bonus, if one of the sites hosts a backup server, it can receive data from the other site through the secure VPN, avoiding transmission in clear text over the Internet.

These examples show how, very concretely, an overlay VPN can simplify the IT architecture while strengthening security. Whether it's to make day-to-day work easier (access to internal tools from anywhere) or to protect vital digital assets, this type of private network gives SMBs a flexibility once reserved for large enterprises with MPLS networks and expensive appliances. Let's now review five representative solutions for setting up such a network, each with its own strengths and drawbacks.

Overview of the mesh VPN solutions compared

There are today several tools for building a mesh VPN. We have selected five commonly mentioned solutions, three of which are self-hostable open source software and two are commercial cloud offerings.

For each solution, we describe its mode of operation (peer-to-peer architecture, need for a central server, etc.), its ease of deployment and use, the level of control offered (ability to self-host, security settings, SSO/LDAP integrations), the cost (open source software vs. license, infrastructure needs) and its maturity/stability as well as the community that supports it.

WireGuard (open source, self-hosted)

Overview: WireGuard is, at its core, an ultra-lightweight and secure VPN protocol, released as open source. More than a complete "ready-to-use" service, it's a low-level tool (built into the Linux kernel since 2020) that lets you create site-to-site or point-to-point VPN tunnels with great performance. WireGuard aims for simplicity of code and configuration: it uses modern cryptographic algorithms (based on the Noise framework) and is made up of only a few thousand lines of code, which makes it easy to audit and very stable. In a mesh-network context, WireGuard can be used as a building block to interconnect several nodes peer-to-peer, but does not by itself provide a discovery mechanism or centralized coordination — everything rests on manual configuration (or the addition of external tools).

Mode of operation: Each WireGuard peer (machine) is identified by a public key, and each VPN tunnel is defined by configuring the keys and allowed IP addresses on both sides. In practice, to build a full mesh network with pure WireGuard, you'd have to configure each machine with the list of all other peers, or at least adopt a star topology with a central node relaying the traffic. WireGuard only encrypts and transports IP packets; it does not manage per-user access rights or the dynamic enrollment of new nodes. It's pure peer-to-peer, with no mandatory server: packets are sent directly between clients (after an initial key exchange). To traverse NATs, WireGuard can use the UDP protocol and supports rudimentary NAT traversal (via the "hole punching" technique), but this often requires each endpoint to know the other's public IP address or to go through a relay if no direct contact is possible. In short, WireGuard provides the equivalent of an encrypted virtual network cable between machines, but it's up to the administrator to create the desired logical architecture.

Deployment and use: For experienced IT staff, deploying WireGuard is fairly simple: you install the module/software on each machine (available for Linux, Windows, macOS, Android, iOS, etc.), generate key pairs, then edit a configuration file listing the authorized peers and their keys. However, for an SMB without deep networking expertise, setting up a full mesh can quickly become tedious as the number of nodes grows. Keep in mind that each new workstation must be configured on all the others (or on a central node) manually. Fortunately, there are solutions to make managing WireGuard easier: for example, open source tools like Netmaker, NetBird or Innernet that provide a Tailscale-style overlay controller while remaining self-hosted, or simple interfaces like wg-easy or PiVPN for certain use cases (often more oriented toward a traditional VPN). Nonetheless, these additional tools are not "official" parts of WireGuard and may require some learning time.

Control and security: Using "raw" WireGuard, access control is handled mainly through the network topology and IP rules. There's no built-in notion of user or identity other than the devices' keys. So if a machine is connected, it sees everything the IP network allows it to see. To apply restrictions, you have to use firewalls (iptables, for example) or define several separate WireGuard networks for different groups. There are no ready-made centralized ACLs in WireGuard — it's up to you to put the filtering in place. Likewise, integration with a corporate directory (LDAP/Active Directory, SAML SSO) is not provided natively: you'd have to develop a system to create/remove WireGuard configs based on your AD users, for example. It's therefore very powerful and entirely under your control, but it takes work if you want a result equivalent to turnkey solutions. The upside is that the encryption is state-of-the-art and minimalist, so there's very little attack surface. WireGuard has undergone in-depth security audits and is reputed to be very secure and reliable.

Costs: WireGuard is free and open source (GPLv2 license). There's no software license cost and no limit on the number of connections. The main cost might be in human time (configuration, maintenance) and possibly in servers if you choose to have a central node or relays. For example, an SMB could deploy a small VPS at €5/month to act as a central node/relay if needed, but that's not mandatory. You also have to consider that, without a management interface, maintenance (adding a user, revoking a key) requires editing configs and deploying to the machines concerned — so technical time.

Maturity and community: WireGuard is one of the most mature VPN technologies today, despite its young age (developed in the 2010s and mainstreamed around 2019). It's directly integrated into recent Linux kernels, which reflects the community's confidence. Major companies and projects use it (for example, the Cloudflare WARP service is built on WireGuard, as was Tailscale originally). The community around WireGuard is very large, with countless tutorials, scripts and third-party tools. However, the community doesn't provide centralized official support since it isn't a "packaged" product — it's the users and contributors who help each other through forums, GitHub, etc. For an SMB, adopting WireGuard means either having the in-house skills to make the most of it, or relying on a provider/consultant who can do so. The stability of the software itself is excellent: it's lightweight, rarely crashes, and the performance is there (you easily reach throughputs of several Gbps on common hardware, which often surpasses OpenVPN or IPsec).

Summary for WireGuard: In short, WireGuard is ideal if you want a very streamlined, high-performance VPN solution that is 100% under your control, but you have to be prepared to manage the manual configuration or to invest in an additional orchestrator to obtain a truly convenient mesh network. For a micro-business or a simple scenario (a few fixed sites to interconnect, or giving access to 2–3 mobile employees), WireGuard can be set up relatively easily and offers exemplary reliability. For broader use with dozens of mobile users, the other solutions presented below could provide a simplified management layer that WireGuard alone lacks.

Nebula (open source, self-hosted)

Overview: Nebula is an open source overlay network tool initially developed by Slack's security team. It was designed to connect tens of thousands of servers and workstations around the world securely and with good performance. Slack made it public in 2019, and a community has since formed around it (notably with the company Defined Networking, founded by Nebula's creators, which continues to support it). Nebula describes itself as a "global virtual packet exchanger": it lets any authorized machines communicate as if they were on the same network, in an encrypted way, based on cryptographic identities. What sets Nebula apart is the native integration of security group and certificate concepts to identify hosts, which makes network-level access control easier.

Mode of operation: Nebula's architecture is peer-to-peer with lightweight coordination. Each node (device) that joins the Nebula network is assigned a certificate signed by a certificate authority (CA) specific to the company's network. This certificate contains the node's identity in the form of attributes (for example: role = webserver, environment = production, location = eu-west, etc. — it's customizable). Nebula uses these identities to decide whether two nodes can communicate. The connection between nodes is direct (p2p) whenever possible, and encrypted (Nebula uses the Noise protocol by default, with AES-256-GCM symmetric encryption). For nodes to discover one another and establish a channel, Nebula introduces one or more discovery servers called lighthouses. A lighthouse is a simple service (which you can host on any server) to which each node announces its presence and its current address. When a node wants to reach another, it consults the lighthouse to obtain its last known address and attempts to open a direct UDP connection. From there, traffic flows directly between the two hosts (with hole-punching techniques to traverse NATs, similar to what Tailscale or ZeroTier does). The lighthouses do not carry user traffic (they only handle introductions), which means the network doesn't depend on them for bandwidth — if one becomes unavailable, new peers won't find each other as easily, but those already connected could keep exchanging if their address doesn't change. Nebula is not based on WireGuard; in fact it draws inspiration from another peer-to-peer VPN named Tinc, but revisited Slack-style for more performance and security.

Deployment and use: Deploying Nebula requires a few extra steps compared to WireGuard, but it remains within reach of an SMB with a minimum of systems skills. First, you have to create a Nebula certificate authority (generate a Nebula CA key) and then, for each machine, generate a certificate signed by that CA. The Nebula command-line tool makes this fairly simple (there are example scripts to create certificates and keys). Next, you need to choose one or two servers to act as lighthouses (ideally in the cloud or in a location reachable by everyone, with a fixed IP). Each client will have a configuration indicating the address of the lighthouse(s), its own identity (certificate + key) and the Nebula firewall rules (we'll come back to that). Once that's done, you launch the Nebula service on each machine (it's a single binary to run, available for Linux, Windows, macOS — and even Android/iOS via mobile apps developed later). Nebula will then automatically connect to the lighthouse(s), obtain the list of network peers and establish the necessary links. Compared to WireGuard, the manual work of enrolling each peer on all the others is not necessary: lighthouses and certificates handle discovery and authentication. Day-to-day use is transparent: Nebula creates a virtual network interface on each machine with an IP address (typically you choose a 10.*** range). Machines can reach each other through these Nebula IPs. The company must, however, maintain the CA and issue/revoke certificates when a new node arrives or a device is compromised. It's a process somewhat like managing VPN certificates or SSH keys, but Nebula provides tools to do it on the command line. Third-party graphical interfaces exist (for example, an open source Nebula cert manager, or automation scripts), but the solution itself does not (to date) have a ready-made web admin console — that's the downside of pure self-hosting.

Control and security: This is one of Nebula's strong points. Thanks to its certificate-based identity system, Nebula includes a distributed firewall where each node applies rules based on the identity attributes of its peers. For example, you can define in the Nebula configuration: "allow traffic on port 3306 (MySQL) only if the sender has the attribute role=db-client and the receiver has role=db-server." Or: "deny all RDP traffic to production machines." These rules are distributed in each client's config and evaluated locally, which means security doesn't depend on a central point: even if someone managed to get into the Nebula network, each host keeps enforcing the configured restrictions. It's a zero-trust approach from the inside: identity (verified by certificate) takes precedence over the real IP address. Compared to the other solutions, Nebula has no notion of a human user or SSO integration — the analogy would rather be that each device is like an approved "entity" via its certificate. So if an employee uses two devices, you'll manage two certificates. Revoking an employee's access means revoking their certificates (Nebula doesn't manage a complex CRL; often you remove the certificate from the network's configuration or change the CA to force a renewal). There's no ready-made LDAP/SAML integration: Nebula targets mainly the network/transport level, not user identity management. However, you can perfectly well couple Nebula with existing tools: for example, a script could use a list of authorized devices from your Active Directory to generate the certificates. As for protocol security, Nebula is solid: used in production at Slack at scale, it has proven it can handle thousands of nodes and sustained traffic. It uses AES-GCM (fast on modern CPUs with AES-NI) and the Noise protocol for key exchange, which is entirely robust. Note that Nebula operates in routed mode (Layer 3 IP) only, not bridged Ethernet, which is sufficient for almost all uses (the same is true for WireGuard and Tailscale, whereas ZeroTier can do Layer 2). This choice avoids, for example, broadcast-storm issues on the virtual network.

Costs: Since Nebula is completely open source (MIT license) and free, the main cost lies in the time and server resources to run it. The lighthouses consume little (they're small directory services; a small VM with 1 vCPU/512 MB RAM can suffice for dozens or hundreds of clients). You often install at least two for redundancy. If you already have servers with a local host or in a data center, you can use them. Managing the certificates can also take a bit of time (especially at the beginning, when enrolling everyone). But once in place, Nebula requires no additional costs, no per-node license, etc. There's also no paid enterprise version (Defined Networking may offer support services, but the software is a single edition). It's therefore attractive for a tight budget, provided you have the technical appetite to maintain it.

Maturity and community: Nebula has reached good maturity in the sense that Slack has used it in production for years. However, outside of Slack and certain tech companies, it's less well known to the general public than WireGuard or ZeroTier. The community exists, mainly through GitHub, Slack (ironically, a community Slack for Nebula), and a few blogs. You'll find documentation on the Defined Networking site, an official guide, etc., but it's not a huge community. That said, Nebula meets a specific need, and those who use it are generally satisfied with its stability. Updates keep coming (for example, official support for mobile clients was added, with a Nebula app for iOS and Android released in 2022, which is crucial for remote-work use). Nebula is also used in some related open source projects (for example, to create security labs or mini VPNs). In terms of stability: it's a Go service running in user space; it can consume a bit of CPU on very fast links (AES encryption in userland) but nothing dramatic for typical throughputs (<1 Gbps). Slack has reported connecting thousands of multi-cloud machines with Nebula without trouble. So for an SMB, the confidence you can place in Nebula is entirely reasonable, provided you're comfortable with the absence of structured commercial support (you are your own support, or you rely on the community).

Summary for Nebula: Nebula is an excellent choice if your SMB wants a self-hosted mesh VPN with a high level of control over internal security. It stands out for its built-in ability to manage access policies based on machine identity, which makes it a powerful tool for segmenting your network. In return, setting it up requires a bit of initial investment (certificates, lighthouse config) and it doesn't have a convenient web portal for inviting a new user in one click — it's more "system admin"-oriented. For a tech company or one with a good IT department, Nebula offers complete freedom and no dependence on an external provider, while delivering robust security. For a very small SMB with no IT skills, Nebula could prove complex, in which case solutions like Tailscale or ZeroTier (cloud) would be more appropriate.

Self-hosted ZeroTier (open source)

Overview: ZeroTier is a virtual network solution that has existed since 2014 and has grown in popularity thanks to its great ease of use and advanced network virtualization features. Technically, ZeroTier presents itself as a planet-scale virtual Ethernet switch: it creates a virtual extended LAN (Layer 2) over the Internet, where each node is assigned a virtual address and can communicate via broadcast, multicast, etc., as on a real local network. The ZeroTier client is open source (code available), which in theory lets you fully self-host the solution. However, by default most users use ZeroTier's cloud infrastructure, which we'll come back to in the next section. Here, we describe the scenario where an SMB wants to manage its own ZeroTier network, without relying on the public ZeroTier cloud.

Mode of operation: On the client side, ZeroTier works fairly similarly to the other mesh VPNs: each node creates peer-to-peer links with the others to exchange traffic, trying the direct connection and otherwise going through relays. The big difference is that ZeroTier operates at the Ethernet level (layer 2), which lets it carry any type of traffic (IPv4, IPv6, ARP, etc.) and even do bridging with a physical network. In concrete terms, ZeroTier nodes join a virtual network identified by an ID (a bit like a Wi-Fi SSID). A key component is the network controller: it's the one that manages authorizations (who is a member of a given network, which virtual addresses they have, which flow rules apply). In the cloud offering, this role is handled by the ZeroTier Central service. In self-hosted mode, you must deploy your own controller. Fortunately, the ZeroTier software includes a controller mode that you can enable through the API or CLI, although it's not documented in a very beginner-friendly way. In addition, ZeroTier uses root servers (called planets and moons in their jargon) to let clients find each other on the Internet. The ZeroTier company operates a set of public root servers by default. In full self-hosting, you can choose not to use those and set up your own root servers (e.g. deploy "moons"). This is an advanced configuration, intended mainly for isolated environments or those with strong sovereignty requirements. In summary, in self-hosted mode, you could: 1) deploy a private ZeroTier controller that manages your virtual network (so you have your own interface/API to authorize members and configure the network), 2) optionally deploy ZeroTier root servers (or moons) so your clients don't need to contact the official infrastructure. ZeroTier clients can be configured to use your planet of servers rather than ZeroTier Inc's, thereby achieving a fully autonomous mesh VPN. The peer-to-peer operation for data remains identical, and ZeroTier excels at NAT traversal (it's one of its strong points; it uses various algorithms to establish direct connections or fall back to relays when necessary).

Deployment and use: As plug-and-play as ZeroTier's cloud use case is, the self-hosting route takes technical effort. The ZeroTier controller is available through a JSON REST API within the ZeroTier daemon itself. This means that to create a network, add a member, etc., you'll have to either call these APIs through scripts or use a third-party tool. The community has produced, for example, ZTNCUI (ZeroTier Network Controller UI), an unofficial web interface to control a private ZeroTier server. ZeroTier Inc has documented the minimum needed to set up a controller and root servers

, but recommends this only for specific use cases (and stipulates that any commercial use of their self-hosted tech must comply with their license — free up to a certain point, but likely paid at very large scale). For an SMB, however, these license limitations shouldn't be an issue; we're talking thousands of nodes before reaching paid territory. In practice, you would install the ZeroTier service on a Linux machine that you dedicate as the controller (it doesn't need to be powerful at all). You would create a network through the API, then configure your ZeroTier clients to "join" that network. When a client tries to join, it will contact your controller (you have to point it to your controller's address instead of the default one) for authorization. You'll see the new device pending and can approve it (through an API call or a third-party UI). After that, the device receives its network configuration (a ZeroTier virtual address) and can communicate with the others. It's very similar to the cloud experience, except that everything is done manually through the API unless you use a helper tool. Another option: ZeroTier offers enterprise clients a more user-friendly on-premises controller pack, but that falls outside the open source scope (it's paid). In terms of daily use, once it's configured, it works just like the cloud: the user launches ZeroTier, enters the network ID and that's it. So self-hosting doesn't affect the end user, only the administration behind the scenes.

Control and security: ZeroTier lets you define Flow Rules associated with a network, which act as ACLs/firewall within the virtual network. For example, you can write a rule to block a given type of traffic between certain machines. These rules, written in a ZeroTier-specific language, are distributed to all clients, which will enforce them. This gives you good control over who can talk to whom and how, directly at the overlay network level. In self-hosted mode, you naturally get all these features without restriction. Integration with identity systems (SSO, directories) is not native in the open source version. ZeroTier Inc introduced SSO/OIDC support for its enterprise cloud console【8†】, but if you manage it yourself, you'll have to reproduce that manually (for example, by interfacing with the API to automatically authorize members whose email appears in an LDAP, etc.). In other words, self-hosted ZeroTier offers full control over the data (nothing transits through third-party servers except what you haven't replaced, such as the roots if you keep the defaults) and over the network configuration, but you lose the simplicity of the SSO or the "magic" that managed services provide. On the protocol-security side: ZeroTier uses its own encryption protocol (not WireGuard) but it's open source and has been proven over the years. Communications are end-to-end encrypted between clients, and the controller sees the metadata (which node is on which network, its public IP address, etc.) but not the content of the packets. When self-hosting, this metadata stays with you. Note that full self-hosting (with your own root servers) even lets you have a ZeroTier network closed in on itself (for example, for machines that don't have Internet access, you could imagine a ZeroTier over an isolated LAN to do internal segmentation). Few SMBs will go that far, but it's possible.

Costs: The ZeroTier software is free up to a certain threshold and open source. Self-hosting it yourself avoids ZeroTier's Premium subscription (which normally applies beyond 50 nodes or to get more features on their cloud). Here, your only costs are hosting the controller and possibly the root servers. A small VPS (or even a local Raspberry Pi) can act as the controller. If you want private root servers spread geographically, that might involve 2–3 small servers around the world. But to get started, it's not necessary; clients can perfectly well rely on the existing public root servers for the initial matchmaking, even if the controller is yours. You just need to be aware that if, for example, the Internet cut off access to the public roots, your clients would no longer find each other. In terms of human effort, installing the ZeroTier controller takes time to understand (the API, management via cURL or a custom tool). It's not plug-and-play. So the "price" is mostly in complexity. You can consider that self-hosting ZeroTier is a niche choice for SMBs that are technically inclined or have strong regulatory requirements.

Maturity and community: ZeroTier is very popular in the IT community, and has been for several years. There are millions of installations. The user community is substantial — but the majority use the cloud version. Nonetheless, many hobbyists and experts have experimented with self-hosting and share tools (we mentioned ZTNCUI; there are also Docker scripts for a minimal controller, etc.). ZeroTier Inc provides documentation on self-hosting, which is a good sign of the platform's openness. The software itself is stable and regularly updated. On a performance level, ZeroTier in userland routing mode is a bit slower than kernel WireGuard in some tests, but remains very respectable (it can reach several hundred Mbit/s, plenty for most SMBs). Its stability is well regarded: it's not uncommon to see a ZeroTier client run for months without interruption, letting remote sites stay permanently connected. As for longevity, ZeroTier Inc being a company (recently acquired by Canonical in late 2023), the technology has good chances of evolving and being supported over the long term. The user community can help through the official forums, Discord, Reddit, etc., if you run into trouble, even in self-hosted mode (though it's less common, so fewer people have the precise expertise).

Summary for self-hosted ZeroTier: This option is aimed at SMBs that want to benefit from the power of ZeroTier (ease of adding nodes, flexible L2 network, fine-grained rules) while keeping everything in-house for privacy or compliance reasons. It's an excellent compromise between raw WireGuard (where everything is manual) and a cloud service (where everything is third-party) — provided you accept the administrative burden. For an SMB with a competent network administrator, this can be an interesting project, especially if it's reluctant to entrust its networks to an external service. For others, the complexity won't be worth the gain, and they'll prefer either Nebula (autonomous but simpler on the controller side) or a cloud service like Tailscale or ZeroTier Central, which offer the same experience effortlessly.

Tailscale (commercial cloud offering)

Overview: Tailscale is a relatively recent mesh VPN solution (launched in 2019) that quickly gained notoriety thanks to its extreme ease of use. Tailscale uses the WireGuard protocol under the hood for encryption, but layers on top a cloud-managed control plane and integration with corporate identities. Tailscale's stated goal is to make the VPN as easy as possible, including for non-specialists: "install, sign in, and it works." It's especially popular with developers, SMBs and even individuals for connecting home labs, because it removes most of the configuration hassle. Tailscale is a commercial SaaS service, although it offers a generous free tier for personal use or small teams of 1 to 3 users.

Mode of operation: Tailscale adopts a peer-to-peer architecture with centralized coordination. Each Tailscale client you install (on a PC, Mac, Linux server, smartphone…) will, on startup, authenticate with the Tailscale coordination server. This central server (managed by Tailscale Inc on their infrastructure) records the client's public key and provides it with the list of other peers in its private network (called a "tailnet" in their jargon). It acts, in a way, as a directory and an authentication server. Once that's done, the client establishes direct encrypted WireGuard connections to the other clients when it needs to. Tailscale also uses a network of relays called DERP (relay servers distributed around the world) to route traffic if a peer absolutely cannot get a direct connection to another (the case of very restrictive symmetric NATs, for example). This entire control plane is transparent to the user, except that it requires the Internet to contact the coordination server. Tailscale has no official self-hosted "offline" mode (although the community has created "Headscale," an open source clone of the server — not covered here). So, in short, Tailscale = WireGuard clients + a central cloud server to orchestrate key exchange and discovery + cloud relays if necessary. The trust model is such that Tailscale (the company) cannot read your data (the WireGuard tunnels are end-to-end between clients), but it does know the map of your private network (which devices, which virtual IPs, who is connected).

Deployment and use: This is Tailscale's strong suit: deployment is nearly instant. For an SMB, this translates into: you create a Tailscale account (often linked to your company's Google Workspace, Microsoft 365 or other domain), you optionally invite teammates, then each person installs the small client on their device and signs in with their company account (SSO). Right away, the device appears in the admin dashboard and is linked to the others. There's no configuring keys, ports or complex firewalls: Tailscale handles everything in the background. The admin interface (via the web) lets you rename devices, group them, and manage tags. The administrator can define ACLs through a configuration file (in JSON or HCL, but Tailscale also offers a simple visual rule editor for common cases). These ACLs allow you to say, for example: "machines tagged as servers only accept connections from users in the Admin group" or "the office printer is not accessible via Tailscale," etc. In terms of effort, it's very accessible: in a few hours you can equip the whole company. Tailscale also handles name meshing: each machine has a name like hostname.tailnet-yourdomain.ts.net, which makes it easy to connect without knowing the IPs. In addition, Tailscale offers handy extra features such as MagicDNS (internal DNS integration), configurable split tunneling, or "Exit nodes" (to reach the Internet through a particular point if you want). For the end user, the Tailscale application simply shows who is connected on your network, with a big on/off button. On mobile, it's as simple as a standard VPN app. This approach makes it a perfect solution for SMBs without a dedicated IT department, or for teams that don't want to waste time on technical configuration.

Control and security: Although Tailscale is cloud-managed, it offers solid control options. The first layer is SSO/identity integration: you can link Tailscale to your identity provider (Google, Microsoft Azure AD, Okta, etc.). That way, when someone installs Tailscale, they have to sign in through that provider — which guarantees they really are an authorized employee. You can also configure automatic or manual validation of new devices. Then, through the ACLs mentioned, you can impose a zero-trust policy: by default Tailscale links everyone, but the admin can decide to restrict things heavily. For example, isolating environments: dev, prod, etc., or doing RBAC (role-based access control) over access to a given application. Tailscale's ACLs are defined in the console and enforced by the central engine, which essentially decides which peers "see" which others. If a connection isn't authorized by the ACLs, Tailscale prevents the two nodes from exchanging (it filters at the packet level). So it's very easy to adjust and audit. On the protocol-security side, since Tailscale inherits from WireGuard, it's solid encryption (ChaCha20-Poly1305 for data, Noise protocol for setup). Tailscale adds automatic key rotation on a regular basis for extra security. Furthermore, since all connections are tied to user accounts, you can revoke a person's access in one click (suspending their account or removing their device). Tailscale also provides audit logs (especially in the paid plans) to know who connected when, etc. A small bonus: Tailscale recently introduced the concept of firewall integration (devices that can act as subnet routers or funnels) and machine certificates — the latter lets a Tailscale device obtain an x509 certificate tied to its identity, which can be used to authenticate the machine to other services. Overall, Tailscale is very complete in terms of security for SMB use, without requiring you to understand all the inner workings.

Costs: Tailscale offers a freemium model. For personal use (up to 1 user / 20 devices) it's free. For a team or SMB, the paid plan starts around US$5 per user per month (with 5 to 10 devices per user included). There's also a slightly more expensive "business" plan adding advanced features (mandatory SSO, custom key rotation, etc.). For an SMB of, say, 50 employees, you can expect a cost around US$250 per month if everyone needs to be connected (which is generally still less than the cost of maintaining your own solution once you factor in human time). Note that the per-user price can be more or less attractive depending on usage: at Tailscale a "user" generally corresponds to a real person with several devices. If your use case is connecting 100 IoT devices or servers with no humans behind them, the pricing isn't a perfect fit (ZeroTier in the cloud bills per device in packs of 25 instead). Tailscale's cost includes the relay infrastructure, the coordination and technical support (for enterprise plans). You can estimate that for a small SMB (<5 people), the free plan or "Teams Starter" can suffice at zero cost. Beyond that, you'll have to budget for a subscription. There are no hidden infrastructure costs because you host nothing on your side (apart from possibly a small server if you use a "subnet router" to connect an entire local network, but that's not mandatory). And of course, you save network administration time.

Maturity and community: In just a few years, Tailscale has built a base of devoted users and an active community. The product is in constant development (new features added every few months) by a dynamic startup backed by investors. This is both an advantage (rapid innovation, addition of useful features) and a point to watch (the company is young and not yet profitable as it stands — however, its growth and adoption suggest it's here to stay, especially since it's built on a standard protocol). The technical community talks a lot about Tailscale on forums, Reddit, etc., for uses ranging from "connect my personal machines" to "replace our corporate Cisco VPN." Opinions converge on its stability: although it's userspace WireGuard (so a touch slower than in the kernel), for most uses people report saturating a typical fiber line without trouble. There are known cases of professional use without a hitch. Since Tailscale is cross-platform, there are clients for Windows, Mac, Linux (including ARM, etc.), iOS, Android, Synology, and even Docker plugins. This ubiquity makes it a safe choice for the near future. The company behind Tailscale is based in Canada, which can reassure some organizations about jurisdiction (even if the servers may be globally distributed).

Summary for Tailscale: For an SMB looking for the simplest possible solution to deploy a mesh VPN, Tailscale is a top candidate. It shines through its ease (both for installation and for managing access via SSO and ACLs), which translates into time savings and fewer configuration errors. Its reliance on a cloud service can raise trust questions (you have to be comfortable with a third party managing control of your network, even if it can't see the encrypted data). Most companies consider this an acceptable trade-off given the benefits. However, for highly regulated sectors or those concerned about sovereignty, the fact that the connection metadata passes through Tailscale's servers (hosted in the United States or elsewhere) could be a deterrent. In short, Tailscale is perfectly suited to SMBs that have few IT resources and want something that "just works" to connect their remote teams and protect their internal services, with a modern approach to security. It will satisfy a little less those who want to customize everything or keep everything on-premises.

ZeroTier Central (commercial cloud service)

Overview: To finish, let's consider ZeroTier in its managed cloud version, that is, the standard use of the service offered by ZeroTier Inc through their ZeroTier Central platform. It's in a sense the equivalent of Tailscale but with ZeroTier's specifics. Here, you don't deploy your own controller; you use ZeroTier Inc's. The appeal is, of course, to benefit from configuration simplicity without worrying about the infrastructure. ZeroTier, as mentioned, offers a very flexible layer-2 virtual network. The cloud solution suits SMBs that want to use ZeroTier without hosting anything.

Mode of operation: In cloud mode, the ZeroTier clients you install on your machines will by default communicate with ZeroTier's public root servers to join the global network (the ZeroTier "planet"). You create a virtual network on the my.zerotier.com site (called ZeroTier Central). This network has a unique ID. Each client that knows this ID can request to join it. The cloud controller (ZeroTier Central) maintains the list of authorized members, their virtual addresses, etc. When one of your devices connects, it receives its configuration from the controller (e.g. "device A has virtual IP 10.10.10.5/24 on the network"). Clients will try to connect peer-to-peer as always, using the ZeroTier infrastructure (roots, relays) to help each other find one another if needed. In cloud mode, it's ZeroTier Inc that maintains this global discovery infrastructure. They can ensure that there are always relays available, that the authority servers respond quickly, etc. For you, the administrator, the ZeroTier Central web interface lets you see all your nodes, group them, enable/disable them, and configure routes or gateways. Since ZeroTier is L2, you can even bridge a local network by checking an option on a node (which lets a node act as a switch to a physical LAN). In a word, the cloud mode offers you turnkey ZeroTier.

Deployment and use: On the usage side, ZeroTier cloud is very close to Tailscale in spirit, with a few practical differences. You start by creating an account on the ZeroTier site (here too there's the option to link Google or Microsoft for user SSO, but it's not oriented toward "multiple users" the same way Tailscale is; generally it's an admin account that manages everything, then you distribute a Network ID to the clients). Next, you install the client on each machine (the ZeroTier client is available for Windows, Mac, Linux, Android, iOS...). To join the network, you can either enter the network ID manually through the client's CLI or UI, or use an invitation link. Once a device requests to join, it appears in your Central console as "pending authorization." The admin must then authorize it (unless you set the network to public "auto-approve" mode, which is rare in a professional context). This manual approval step is a slight friction compared to Tailscale, where user authentication is enough to auto-validate devices. But it ensures that even if someone knew the ID, they couldn't get in without validation. Once authorized, the device gets its address (which you can optionally fix or leave auto-assigned). Right away, it can communicate with the others according to the defined rules. The console lets you define flow rules in the ZeroTier language to implement ACLs. For example, you can write that a certain range or a certain tag cannot communicate with another. This language is powerful but a bit esoteric for a beginner — it's less friendly than a Tailscale access list, for example. Fortunately, for small networks, you can get by simply by authorizing only certain machines and keeping default rules. ZeroTier Central also lets you set the network's IP configuration (IPv4/IPv6, etc.), which is quite flexible (you can have several virtual subnets, multicast, etc.). For the end user, ZeroTier keeps a low profile: on a PC it runs in the background, on mobile it behaves like a standard VPN to switch on. Management can be a bit more technical than Tailscale because you sometimes have to explain to the user how to enter the ID and wait for approval, but it's overall fairly simple.

Control and security: In cloud mode, it's ZeroTier Inc that holds the control plane. So your nodes contact their servers for everything coordination-related. The confidentiality of the traffic is still ensured (end-to-end encryption), but the metadata (who is on which network, when a machine connects) is potentially visible to them. They do, however, have a policy of not snooping, and even offer SSO for access to the admin console (for enterprises, via SAML/OIDC). Compared to Tailscale, ZeroTier doesn't have a strong notion of "users with individual accounts" at the service level — it's more oriented toward "you manage a network and you add nodes to it." That said, they've introduced the ability to associate accounts and delegate admin to others on a network, etc. Regarding internal network security, we mentioned the Flow Rules that let you write very fine-grained ACLs if needed. ZeroTier also lets you declare local router networks: for example, a node can advertise that it routes the 192.168.1.0/24 subnet to the VPN — and thanks to that, you can access a whole remote LAN through a single client (it's equivalent to Tailscale's subnet router function). ZeroTier's security has been proven cryptographically, and the L2 flexibility means certain things are possible (e.g. you could run a custom protocol or remote network discovery, which Tailscale doesn't allow since it's limited to IP). For an SMB, you just need to be aware that ZeroTier cloud means trusting the company with access management. You can still minimize the risks by using two-factor authentication on the admin account, segmenting the networks (several ZeroTier networks for different uses) and applying strict rules from the start to limit each node's reach.

Costs: ZeroTier Central is free up to 50 nodes (devices), which, for quite a few small SMBs, could already be enough. Beyond that, they operate on a node-pack model: you buy 25 additional nodes each time, for about US$29/month per pack of 25. So if you have 100 devices, that works out to around US$58/month (2 extra packs on top of the 50 free). This pricing model can be more predictable than Tailscale's per-user one, particularly since if one person has several devices it counts as several nodes. ZeroTier also offers an Enterprise plan with custom pricing and more services (support, a packaged on-prem controller, etc.). But for a standard SMB, you'll be on the Basic plan (free/small packs). In terms of indirect costs, using ZeroTier cloud means saving administration time compared to the self-hosted solution. Everything is included in the service. So financially it's quite attractive, especially since the 50-free-node bar is high for many organizations (e.g. 20 employees each with a PC + mobile + maybe a server or two barely reaches ~50). You just have to keep in mind that in case of growth, you move to a paid tier, but a modular one.

Maturity and community: As already noted, ZeroTier is a mature solution with a vast community. In cloud mode, you automatically benefit from infrastructure updates without seeing them. The company has proven itself in terms of service reliability. For example, it's rare to hear that "ZeroTier is down globally" — their network is distributed and redundant. Obviously, a dependency exists: if the company shut down tomorrow, your networks would disappear (you could then switch to self-hosting, but that would be a transition to manage). However, the current trend (acquisition by Canonical, integration into various routers and appliances) gives confidence in its longevity. The user community can help you on the forums if you have a question, and ZeroTier Inc provides documentation and support (direct support and SLAs being mainly for Enterprise customers). Technically, since the solution is stable, you probably won't need much assistance after the initial phase. A side point: since ZeroTier is open source, there's a certain guarantee of transparency about how it works, even if in cloud mode the precise backend is proprietary (they don't publish their complete Central server).

Summary for ZeroTier cloud: This is a very well-balanced solution for SMBs that want a flexible overlay VPN with minimal maintenance. Compared to Tailscale, ZeroTier cloud offers more network options (L2, choice of addresses, bridging…) but a tiny bit less "enterprise" integration (no fine-grained native per-user management, no multiple identities — though you can always couple it with other tools). The ease of use is excellent even if the web interface is a bit more technical. If your SMB has, for example, specific needs such as connecting not only PCs but also network equipment or hardware that needs to be on the same virtual subnet, ZeroTier is ideal. If you're looking above all for simplicity for mobile users, Tailscale is a touch more user-friendly, but ZeroTier holds its own very well and remains understandable as long as you take an hour to read the basic docs. In terms of sovereignty, ZeroTier cloud raises the same question as Tailscale: control data outside your control. However, the option to migrate to self-hosting later exists, which can be reassuring (you could start in the cloud, then if one day you want to bring it back in-house, it's doable with a bit of effort).

Concise comparison of the five solutions

Now that we've reviewed each solution, let's summarize the key comparison points according to criteria that matter to an SMB:

• Architecture and mode of operation: WireGuard is purely peer-to-peer with no infrastructure apart from what you create yourself (manual topology). Nebula and ZeroTier are peer-to-peer with coordination: Nebula requires deploying one or more self-hosted lighthouses (discovery servers), while ZeroTier can rely either on your own controllers/roots or on those in the cloud. Tailscale and ZeroTier (cloud) rest on centralized coordination managed by the provider (SaaS servers) to orchestrate the peers, while keeping the data exchanges direct and encrypted between clients. One notable difference: ZeroTier operates in virtual Ethernet network mode (L2) whereas the others are IP-oriented (L3), but for typical SMB use (IP access to services) that doesn't change much, unless you need advanced network features.
• Ease of deployment: From simplest to most technical, you could rank them like this:
  • Tailscale: the simplest, installed in a few minutes, friendly interface, virtually no network config to know.
  • ZeroTier (cloud): also very simple, a bit more "techy" in the interface than Tailscale, but largely accessible. The manual approval of nodes can require a little internal coordination.
  • Nebula: intermediate — requires generating certificates and configuring files, but with a good tutorial you'll manage. Once installed, it runs on its own.
  • WireGuard: technical — manual configuration of each tunnel; it can suit a few machines but becomes complex at scale without additional tools.
  • ZeroTier (self-hosted): also technical — deploying a controller and handling the API isn't trivial; it's one more step compared to Nebula. You could say it's the most demanding in terms of initial administration (unless you subscribe to the Enterprise version, which makes it easier).
• Control and security features:
  • WireGuard offers total control since you manage everything, but has no built-in security features (no ready-made ACLs, no user identities). You'll have to supplement it with other measures (firewall, etc.). It's very secure in encryption, but not "secure by policy" by default.
  • Nebula includes a very powerful identity-based firewall. You can finely segment your network by groups of machines. On the other hand, no direct user/directory integration — it's rather machine-centric.
  • ZeroTier offers flow rules that let you set up similar micro-segmentation (example: this group of IPs can't talk to that other one). In cloud mode, you also potentially benefit from SSO to access the admin console. In self-hosted mode, you define everything. ZeroTier can integrate with existing systems through its API to automate access control.
  • Tailscale provides very fine-grained management by users and devices. You can use SSO for authentication, define ACLs by users/groups, and view access logs. It's probably the one that offers the most "high-level" controls while remaining turnkey, embodying the Zero Trust concept for SMBs (minimum privileges granted, easy revocation, etc.).
• Integration and customization:
  • WireGuard can integrate with just about anything (since you're the one doing it) but has no specific directory or other features.
  • Nebula and self-hosted ZeroTier require a bit of engineering if you want to tie them into corporate management (for example, writing a script that generates a Nebula cert when a new employee arrives, or that calls the ZeroTier API when you update a directory). They offer a lot of freedom to customize (open source obliges), but you have to get your hands dirty.
  • Tailscale and ZeroTier cloud already provide a lot: Tailscale has ready-made integrations (e.g. you can connect Tailscale to Okta or Active Directory in a few clicks to import user groups). ZeroTier cloud also has an API if you want to automate adding devices, and you can link the admin account to an SSO for management.
  • If you need LDAP/SAML integration for connecting users to the VPN: it's direct with Tailscale, indirect with ZeroTier (you can use SSO for the console or authenticate on the client app through a script, but it's not native for the VPN session itself, since there's no concept of a user). Nebula/WireGuard don't have that at all natively.
• Costs and business model:
  • WireGuard, Nebula, ZeroTier (self): no license costs, only hosting costs (minimal) and human maintenance. These are ideal solutions if the budget is very tight but the time/skills are available.
  • Tailscale, ZeroTier (cloud): subscription model. Tailscale per user (~US$5/user/month standard), ZeroTier per device beyond 50 free (~US$1 per device/month in the packs). For an SMB of 20 people, for example, Tailscale would cost ~US$100/month, ZeroTier probably free or ~US$30/month depending on the number of devices. These costs include support and infrastructure; you should also view them as the savings of not managing VPN servers or spending the time. Note: for very light use (a few users), Tailscale can come out a bit more expensive than ZeroTier, but for more users each with several devices, it balances out or favours Tailscale. In any case, both are far cheaper than traditional enterprise VPN solutions or proprietary SD-WANs.
• Maturity, stability, community:
  • WireGuard: very stable, the de facto standard of the modern VPN, a huge community (but no official support other than the community).
  • Nebula: proven at Slack and a few others, a more limited community but active in its field. Stable software, but one that requires a bit of understanding.
  • ZeroTier: more than 10 years in existence, a large user base, robust code. A large community, and now the backing of a bigger company (Canonical) that can guarantee continuity. The open source / pro service duality gives it a good image of reliability.
  • Tailscale: younger but growing very fast, an enthusiastic community (especially in the dev and startup world), many contributions (guides, compatible open source tools). It has shown its technical reliability and is built on WireGuard, which is solid. The main point of attention is the company's longevity (a startup), but it seems to be on the right track given the adoption it's seeing.

Ultimately, each of these solutions has its strengths:

• WireGuard excels in performance and minimalism, perfect for administrators who want a "homemade" setup with no superfluous layer.
• Nebula shines through its built-in security model (certificates, group-based filtering) and its complete independence, ideal for a tailored use where you want to master every aspect.
• ZeroTier (self-hosted) offers near-infinite flexibility (you can really shape your network however you like) and guarantees that nothing leaves your infrastructure, which is great for sovereignty, at the price of implementation effort.
• Tailscale takes the prize for simplicity and ergonomics, while providing the features a modern SMB expects (SSO, ACLs, mobility).
• ZeroTier (cloud) provides a good balance between ease and rich network functionality, with a generous number of free devices that lets you test extensively before committing to costs.

Recommendations

To help you make a choice, here are a few recommendations based on the profiles and needs of SMBs:

• For very small businesses (micro-businesses) or SMBs without a dedicated IT department: Tailscale often stands out as the most suitable solution. Its ease of installation and management means that even a manager or an "amateur" tech enthusiast can set it up. You don't have to manage a server, the interface is clear, and authentication through an existing Google/Microsoft account simplifies onboarding. For example, a 10-employee fully remote startup could, in an hour, give everyone access to the private network (to reach a NAS, a database in a private cloud, etc.), without worrying about the technical details. The cost will be modest (probably free or the Team plan at around thirty euros a month). If you're allergic to any configuration and the confidentiality of the metadata isn't critical for you, Tailscale is an excellent "plug & play" choice.
• For SMBs with a reduced IT department that prefer to avoid foreign SaaS: ZeroTier in cloud mode can work if the concern is mainly financial or technical rather than legal. Indeed, ZeroTier can run almost entirely for free up to a certain point, which is appealing for an SMB of 30–40 people max. It's also a simple solution to deploy, although a bit more technical than Tailscale (you'll have to manage device authorizations and possibly write a few flow rules). If the sovereignty of the control data is a concern (e.g. a medical or legal sector worried about the CLOUD Act), then neither Tailscale nor ZeroTier cloud will be fully satisfactory — you'd have to consider self-hosting. But for a standard SMB without hyper-sensitive data, ZeroTier cloud lets you keep the advantages of the mesh VPN at no cost and with the option, in the medium term, of migrating on-premises if required. Think of ZeroTier cloud if you have somewhat special network needs (e.g. connecting two local networks together, or using non-IP protocols across the VPN), because its L2 approach makes it more flexible for those cases.
• For SMBs concerned about sovereignty, in regulated sectors or with sensitive data: Self-hosted open source solutions come into their own. Nebula could be the best compromise in this scenario: it was designed for security and performance, and you keep full control (your lighthouse servers are with you or in a trusted local cloud, the certificates are managed in-house). Nebula is appropriate if you have a systems or network administrator able to implement it. It's very good for, say, an SMB in industrial technology or finance that absolutely must compartmentalize its access: Nebula gives you the guarantee that no third-party provider can add a "hidden" node or see your machines (a concern sometimes raised for cloud mesh VPNs【0†】). Alternatively, if your team already knows Linux and networks well, and you want to build something bespoke, you could use WireGuard as a base — either through an orchestrator (such as Netmaker or Netbird) to regain coordination features, or through in-house scripts. WireGuard would suit a more static or simple use (e.g. permanently linking 3 of a company's sites). But for multi-user, mobile use with frequent rotation, it will quickly become heavy to manage manually.
• For medium-sized businesses (50–200 employees): We're stepping a bit outside the classic SMB frame, but you can imagine a scenario where you're looking to equip many staff members. In this case, the question of scale and centralized management arises even more. Tailscale can still work (its paid plans cover this kind of size and they support enterprise integrations like Okta, which helps with automation). ZeroTier cloud would start to incur a non-negligible cost if you go well beyond 50 devices, but it remains affordable compared to traditional MPLS or SD-WAN solutions. Nebula could support 200+ nodes with no technical problem, but managing the certificates might require automation (writing a small in-house tool, for example). There isn't yet a large commercial suite around Nebula to make administration easier (Defined.net may offer bespoke services). Integration with a directory will likely be crucial at this scale: advantage Tailscale and ZeroTier (via SSO or API), whereas Nebula/WireGuard would require more work. In short, for 100+ users, it's likely that a managed solution (Tailscale or ZeroTier) will be the most efficient in time and features.
• By industry sector:
  • In the technology or software sector, teams are often comfortable with open source, so Nebula or WireGuard can be adopted easily, and the sovereignty/open source aspect can be a philosophical plus.
  • In the manufacturing or logistics sector, where there may be IoT, machines, etc., ZeroTier is interesting because you can embed it in various environments (e.g. there's a ZeroTier client for some embedded solutions) and its L2 side lets you integrate systems that may be somewhat older and wouldn't support NAT, for example.
  • In the services, consulting and general SMB sector, Tailscale is attractive because it reduces the load on a possibly small IT team, while adapting to hybrid cloud infrastructures (you can, for example, place a Tailscale relay in an AWS or Azure VPC to give employees access without exposing the ports).
  • For the public or parapublic sector in Quebec, the question of data outside Canada may steer you toward Nebula or self-hosted ZeroTier if internal policy requires it. However, this has to be weighed against the resources available to maintain it.

In conclusion, mesh/overlay VPNs are becoming a pillar of the infrastructure of modern SMBs, in the same way traditional VPNs were for large enterprises 15 years ago, but with the flexibility and security suited to the era of the cloud and remote work. Each solution presented addresses these needs from a different angle: from pure do-it-yourself open source to the ready-to-use service.

To make your choice, identify your priorities: simplicity and speed of implementation, minimal budget, full control and sovereignty, integration with your existing tools, etc. There's no universally "best" solution: a small 5-person web agency won't have the same answer as a 50-employee industrial company handling sensitive intellectual property. What matters is that you become aware of the stakes (don't let your access points fragment or get cobbled together without an overall vision) and that you opt for a structured approach with one of these tools. With a well-chosen mesh VPN, your employees will be able to work securely as if they were all in the same place, and your critical data will stay safely behind controlled digital walls. It's an investment that strengthens both the peace of mind of your IT team and the confidence of your clients/partners in the robustness of your company against digital threats.

Sources and bibliography:

• Slack Engineering – Introducing Nebula, the open source global overlay network from Slack (2019)

Tailscale – Nebula vs. Tailscale: Which VPN Alternative is Better for You?

Netmaker Blog – Tailscale vs ZeroTier: Comparing Top Overlay VPN Networks (2023)

Opensource.com – How I manage my own virtual network with ZeroTier (2022)

• PME Conforme – Souveraineté des données : Le Québec est-il prêt à reprendre le contrôle ? (about Law 25 and the cloud)

Hacker News (discussion) – Be aware, when you use mesh VPN products such as ZeroTier, Nebula or Tailscale… (2021)

(considerations on the trust and security of mesh VPNs)