Hi all, I have been ripping my hair out trying to fix this over the last few days.

I changed my router from the default EE Smart ISP router to a Cudy WR300 (PPPoe was detected) and I suddenly lost all internet to the server despite all setting being the same as the old router. (things like the unraid App Store and dockers have no internet but I'm still able to access my home assistant VM from Nabu Casa)

After much troubleshooting, it will work for a little bit then disconnect but then work for a little while if I reboot the router only to then fix again.

I have tried everything on all forums and chatbots but no avail.

The set up and what I've tried:

Cudy router with Adguard DNS (tried with adguard, 1.1.1.1, 8.8.8.8 etc - always the same issue)

Unraid network DNS is 1.1.1.1 & 1.0.0.1 in DHCP (tried everything you can think of)

Turned off ipv6 as a recommendation (despite dual stack working with EE router)

Removed and re-added tailscale

I am completely lost on this and the issue is above me, would really appreciate any help possible, happy to send any logs or details and that might help - diagnostics attached.

Thank you!

oldheart-diagnostics-20251215-2309.zip

8 hours ago, montgomery said:

it will work for a little bit then disconnect but then work for a little while if I reboot the router only to then fix again.

Sounds like a router problem to me; if it were a config issue, it should either always work or always not work.

One thing that has caught me on a new router is If you are setup unraid as a static IP make sure you setup IP reservation in the router. If you look under attached devices in the router you can see if you have any duplicate IPs.