Tailscale routing problem

23rd February 2026

Noticed an odd problem

When IPv6 is DISabled on the local NIC but ENabled on the Tailscale NIC and 4to6 nat is disabled

and the subnet has a combination of Tailscale subnet router AND hosts with the tailscale client installed

tailscale routing gets confused

Can’t ping some hosts, can’t get to shares using local IP address

sometimes fixed by making sure tailscale is up on both ends

Possible fixes:
1. Don’t install clients as a service, get users to enable client when offsite and disable client when onsite
2. Disable IPv6 on the Tailscale client for any internal devices with the Tailscale client installed
3. Enable 6to4 routing?