What is ZeroTier?

ZeroTier is a software tool that creates virtual networks over the internet, letting devices talk to each other as if they were on the same local LAN. It works on many platforms (Windows, macOS, Linux, Android, iOS) and requires no special hardware.

Let's break it down

  • Software tool: a program you install on a computer or phone.
  • Virtual networks: a “pretend” network that exists in software, not with physical cables.
  • Over the internet: it uses the regular internet connection you already have.
  • Talk to each other as if on the same local LAN: devices behave like they’re plugged into the same router, so they can share files, run games, or access services without extra setup.
  • Works on many platforms: you can use it on almost any device you own.
  • No special hardware: you don’t need extra routers or switches; just the software.

Why does it matter?

ZeroTier makes remote collaboration and device management simple, secure, and cheap. It removes the need for complex VPNs or port-forwarding, letting you connect home, office, and cloud resources with just a few clicks.

Where is it used?

  • Remote workers linking their laptops to the office network to access internal tools.
  • Home automation enthusiasts connecting smart devices across different houses as one network.
  • Game developers creating private multiplayer servers that players can join without public IPs.
  • Small businesses linking multiple branch locations without buying expensive MPLS lines.

Good things about it

  • Easy to set up: a few clicks and devices are connected.
  • Cross-platform support: works on almost every OS and device.
  • Strong encryption: traffic is secured end-to-end.
  • Scalable: from a few devices to thousands without major performance loss.
  • Free tier available for personal and small-team use.

Not-so-good things

  • Reliance on ZeroTier’s central controllers for network management (though self-hosting is possible, it adds complexity).
  • Limited advanced routing features compared to enterprise-grade VPN solutions.
  • Performance can be affected by the quality of the underlying internet connections.
  • Some corporate firewalls may block the UDP ports ZeroTier uses, requiring extra configuration.