I run dnsmasq on my laptop to handle some complicated DNS settings that vary depending on where I am and what context I’m working in. This works fine with tailscale except when using an exit node. If I use an exit node, even with “Use Tailscale DNS Settings” turned OFF, tailscale overwrite the resolv.conf file and DNS lookups fail.
I have MagicDNS disabled for my account. Running tailscale set --accept-dns=false seems to have no effect when using an exit node.
For what it’s worth, I believe DNS and the exit node worked fine until I enabled “Allow Local Network Access”. Now regardless of the “Allow Local Network Access” setting, DNS is overwritten when the exit node is activated.
❯ dscacheutil -q host -a name google.com
name: google.com
ipv6_address: 2a00:1450:400f:80c::200e
name: google.com
ip_address: 142.250.74.142
❯ tailscale set --exit-node xen-bal01
❯ dscacheutil -q host -a name google.com
❯ ping google.com
ping: cannot resolve google.com: Unknown host
❯ tailscale set --accept-dns=false
❯ dscacheutil -q host -a name google.com
❯ ping google.com
ping: cannot resolve google.com: Unknown host
❯ tailscale set --exit-node ""
❯ dscacheutil -q host -a name google.com
name: google.com
ipv6_address: 2a00:1450:400f:80c::200e
name: google.com
ip_address: 142.250.74.142
Tailscale version 1.44.0
MacOS 11.7.8