Hi all,
Got a sort of weird (and new, at least to me) issue occurring with wireguard. I've got a wireguard VPN set up with my graphene 5a. When I'm on the same network as the VPN server (not the same subnet, but same campus/institutional network, same AS, low latency, not many hops) it works fine. When I'm on another network (eg, home or mobile), system DNS fails. Traffic still passes- pings, connections direct to IP, apps (like tor browser) that do their own DNS, but any app that uses system DNS (eg Vanadium, FairEmail, etc).
Private DNS is set to automatic. I run the VPN server and it's not doing any filtering based on endpoint address or key or anything.

I had initially assumed some sort of filtering issue due to traffic meddling at some network boundary, but it seems like that should break everything via the VPN and not just the DNS for certain apps. Perhaps a latency thing? This all worked okay as of last week; feel like this broke over the weekend.

System is kept up-to-date. WG client is 1.0.20231018 though this broke with the a 2022 version which I uninstalled + reinstalled sideloaded from the wireguard official apk as part of troubleshooting.

Anybody seen anything like this, or have any other ideas?

11 days later

I'm having similar issues as of a few days back. Nothing has changed in my setup recently, but whenever I enable wireguard I lose dns. What's even stranger is that I'm seeing succesful queries in my dns log for my wireguard client.
Haven't had time to troubleshoot any deeper yet, without wireguard but on wifi (so using exact same dns server) works fine.