Tailscale version 1.24.0
Your operating system & version Ubuntu 20
After i installed tailscale my DNS servers got set to 100.127.0.53 and 100.127.1.53
I went to the tailscale console and set the public DNS to 8.8.8.8 and 1.1.1.1. That did not help.
I currently cannot resolve DNS on this server and do not know how to resolve it.
100.127.0.53 and 100.127.1.53 appear to be the DNS servers used by SoraCOM; is that your carrier?
SoraCOM is also using CGNAT within their network, which will conflict with Tailscale’s use of CGNAT. I think if you set Tailscale to “override local DNS” and supply 8.8.8.8 anf 1.1.1.1 as global resolvers, it should work. You may have to “tailscale down” on the Ubuntu server in order to let it get back to a working DNS config, and then “tailscale up” again.
Thanks!! IT is SoraCOM!!!
Overriding the DNS worked.