tailscale down breaks system DNS and causes complete network loss on MacOS

[MrIceman]

After running tailscale up, my system functions normally. However, when I run tailscale down, my internet connection breaks entirely — despite being connected to my local WiFi network. This appears to be due to DNS settings not being properly restored.

After running tailscale up, /etc/resolv.conf is overwritten with:

nameserver 100.100.100.100

When I run tailscale down, no DNS settings are restored.

Result: I can't resolve any domains (e.g., google.com fails).

I remain connected to the network (e.g., ping 8.8.8.8 works), but all name resolution is broken.

The DNS settings are only restored once I revoke the network permissions for tailscale from the system settings

System Info
OS: MacOS Sequoia 15.1
Macbook M1 Max