Trouble with dnsmasq

[Travison]

Hey,

Lately I've been having some trouble with dnsmasq on my router AC68U running 384.14_2, it seems that random websites, like wikipedia or paypal for example, don't get resolved. The problem is only for a few minutes and then it start working again, as can be seen from this screenshot. No actions were taken between nslookups, it just started working again.

https://i.imgur.com/7263chk.png

The router itself uses 1.1.1.1 to resolve and seems to be working fine resolving addresses in ssh. It's also worth mentioning I have an additional hosts file for dns blocking, but the sites are not listed in there.

Any suggestions or tips on how to fix this?

 

[ColinTaylor]

Next time this happens try querying 1.1.1.1 directly instead of your router. That way it might show that it's not actually anything to do with dnsmasq.

 

[EmeraldDeer]

So from Windows invoke just nslookup and then set DNS server with the "server" command

>nslookup
Default Server:  UnKnown
Address:  2601:18f:800:b426::1

> server 1.1.1.1
Default Server:  one.one.one.one
Address:  1.1.1.1

> time.cloudflare.com
Server:  one.one.one.one
Address:  1.1.1.1

Non-authoritative answer:
Name:    time.cloudflare.com
Addresses:  2606:4700:f1::123
          2606:4700:f1::1
          162.159.200.1
          162.159.200.123

 

[ColinTaylor]

So from Windows invoke just nslookup and then set DNS server with the "server" command

Or you can do it directly from the command line which I find is quicker when trying to "catch" a transient problem before it disappears.

C:\>nslookup wikipedia.org 1.1.1.1
Server:  one.one.one.one
Address:  1.1.1.1

Non-authoritative answer:
Name:    wikipedia.org
Addresses:  2620:0:862:ed1a::1
          91.198.174.192

 

[Travison]

Next time this happens try querying 1.1.1.1 directly instead of your router. That way it might show that it's not actually anything to do with dnsmasq.

I tried that, it resolved normally when I did "nslookup wikipedia.com 1.1.1.1"

 

[ColinTaylor]

Unless there are errors appearing in the router's syslog or the problem occurs with some predictability it's going to be difficult to diagnose.