I am setting up a development server in my flat. I have set up an Ubuntu DNS server on it and have added the zone weddinglist (just weddinglist - no TLD. It\'s just an internal
I know it's not your specific problem, but I faced the same symptoms when I configured a static IP address in the network adapter settings and forgot to enter a "Default Gateway".
Leaving the field blank, the network icon shows an Internet connection, and I could ping internal servers but not external ones, so I assumed it was a DNS problem. NSLookup still worked, but of course, ping failed to find the server (again, seemed like a DNS issue.) Anyway, one more thing to check. =P