Tailscale open-sources Tailcat: No login or IP assignment required, enabling direct tunneling between two machines
2026.09.01 18:34:32
From Beating AI Express: Tailscale has open-sourced Tailcat, a tool that allows two machines to connect directly without signing up for an account or joining the same Tailnet—all you need is a single address string. It retains Tailscale’s WireGuard encryption, NAT traversal, and DERP relay functionality, but eliminates the need for a Tailscale account or control plane. Running Tailcat on one machine generates a connection address string; sharing this with another machine enables file transfers, port forwarding, or SSH access. Connections first use DERP to locate the peer, then attempt a direct peer-to-peer UDP connection; if hole punching fails, traffic falls back to the DERP relay. The entire process runs in user space, with no modifications to system routes or DNS settings. Tailscale lead engineer Brad Fitzpatrick first built a Tailcat prototype back in 2023, but the project was largely sidelined. He revived it recently as AI agents began connecting en masse to sandboxes, remote VMs, and test machines. Fitzpatrick uses Tailcat to let agents connect temporarily to Raspberry Pi devices, EC2 instances, and Windows hosts—no pre-configured accounts or network access for the agents required. Tailcat is not a full replacement for Tailscale: it lacks user identities, permission policies, and device management, and its connection address must be treated like a password. Tailscale-hosted Tailcat DERP relays log metadata, have rate limits, and do not offer uptime SLAs; for greater stability or privacy, users can deploy their own DERP relays.
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