DNS lookups work from LAN but not on router

[Nerre]

I think I've had this issue before, but since I have not changed anything regarding DNS in my configuration I'm not sure where to start looking...

The only thing I have changed is the uplink bandwidth in the QoS settings (speedtest.net was giving me a bit low numbers and I realised I had set it a bit low).

/etc/resolv.conf points to localhost
/tmp/resolv.conf points to ISP DNS servers (I think, it at least lists two external IP)

Dnsmasq is set to use /tmp/resolv.conf

Whatever I try to do I get "bad address"...

But, from the computers on the LAN everythings works as normal (they are using the router as DNS server).

I have tried to reboot with no improvement.

What do I check next?

 

[Nerre]

It seems as if the answer was that ISP DNS servers did not respond... The reason computers on the LAN worked was probably that they used IPv6 DNS servern. Have to check why the ISP DNS servers aren't working, but when manually setting the router to use googles DNS servers everything seemed to work.

Not really sure what's going on with the ISP, because the IP address indicates another ISP than before... Included in our fiber installation is 36 months free internet, it was initially from Universal Telecom, but now the IP address belongs to Alltele... I haven't heard anything about a change, but as long as I have connectivity and the bandwidth I'm supposed to have I don't care