Try this:
Replace the ip with the one of your router.

This dumps dns traffic only, probably what you need:
sudo tcpdump -nls128 host 192.168.1.1 and port 53 | tee tcpdump.txt

This dumps everything going from/to your router:
sudo tcpdump -nls128 host 192.168.1.1 | tee tcpdump.txt
 This solution taken from 
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/313218

-- 
9.04 is REALLY unstable! and slow!
https://bugs.launchpad.net/bugs/368370
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