out of ideas: wireguard connects, tunneled lan access, but no wan (only one specific device in one specific lan)

BUT one device (travel router) does not work via wireguard in one specific lan

What LAN is this? At home? At a remote site? where?

What is the ip/subnet of said LAN? Does it overlap with anything at your home?

my travel router (gl.inet Opal) though connects with wireguard but effectively almost no traffic passes through. I can contact my home network and can ssh into the raspberry etc... but no WAN connection and no larger data chunks eg via plex

Is this on a particular network that it doesnt work like a hotel or location? You said you tested the travel router at home using mobile hotspot and it worked so what network did it not work on?

/r/WireGuard Thread