From the newsletter:

We’ve recently released tailcat, a remix of pieces of Tailscale that gives you a way to use the open-source Tailscale data plane without the Tailscale control plane, written by the people who made Tailscale.

Specifically, tailcat is both an open-source Go package and a CLI tool using that package. It lets you run a server-side listener and a client to connect to that server, moving bidirectional bytes back and forth.

Potential usage info from the website link - https://tailscale.com/tailcat:

Setting up a tailnet makes sense when you need governable access, identity, and policy. Sometimes you don’t. You might need to SSH into a development environment for an hour. Give an agent access to a test machine for one task. Connect a game session. Move a file between two machines. Tailcat gives you a secure connection without requiring either side to become part of a larger network.

A technical explanation from the github:

Tailcat is a remix of Tailscale open source pieces to act like netcat, but over Tailscale’s data plane, without Tailscale’s control plane. Tailscale’s data plane (magicsock, internally) gives you point-to-point WireGuard®-encrypted tunnels between two machines with DERP as the NAT-hole-punching communication side channel and the ultimate relay-of-last-resort if NAT traversal fails. Instead of using the Tailscale control plane, all tailcat connection metadata is exchanged out of band, however you want.

License: BSD 3-Clause License