Cannot access local LAN/Router

[Marcus]

For some reason I cannot access local IPs, e.g. my ADSL router on 
192.168.2.1. Cannot ping them even. I took the Guarddog firewall off 
and it made no difference, unless there could be somewhere else 
blocking access? I can access the internet.

However, I can access local IPs with a Knoppix CD, or a Puppy Linux CD. 
The problem seems to be my Kubuntu setup.

Running Dapper. Anybody know what config changes might help?

Thanks,

Marcus