Router DNS server not working

[dave14305]

So does OP have the URL Filter whitelist configured (mis-configured) in the Firewall?

 

[blava_b]

IPtables is not something I have a lot of experience with. How do I remove that line? I assume you mean this one?


-A INPUT -i br0 -p udp -m udp --dport 53 -j DROP

 

[blava_b]

I don't know if it's related or just a red herring, but I did notice this in my logs when I rebooted the router this morning.

warn Mar 09 08:52:23 Firewall-RT-AC86 avahi-daemon WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
info Mar 09 08:52:23 Firewall-RT-AC86 avahi-daemon No service file found in /tmp/avahi/services.

 

[blava_b]

I did some more testing and port 53 is responding on the router, but it clearly isn't answering DNS queries. It makes me think that IPtables drop line is the culprit.

 

[ColinTaylor]

IPtables is not something I have a lot of experience with. How do I remove that line? I assume you mean this one?


-A INPUT -i br0 -p udp -m udp --dport 53 -j DROP

Simply turn off URL filtering in the GUI.

 

[blava_b]

That resolved the issue. So does that indicate that URL filtering is broken?

 

[ColinTaylor]

That resolved the issue. So does that indicate that URL filtering is broken?

URL filtering has it's limitations but that wasn't your issue. Your issue was that you had enabled it and selected "whitelist", but didn't have anything in the whitelist. So it was doing what you asked it to do, block all URL/DNS requests.

 

[blava_b]

Thank you for your assistance everyone.