See https://tailscale.com/kb/1232/derp-servers/ https://tailscale.com/kb/1232/derp-servers/ They use those relay servers for handling NAT issues, and figuring

See https://tailscale.com/kb/1232/derp-servers/ https://tailscale.com/kb/1232/derp-servers/ They use those relay servers for handling NAT issues, and figuring out which one has the lowest latency requires them to ping them all. That said you can run your own one if you need to.