Can you see if there is any difference in the network configurations between your FC1 and FC2 installation? Like MTU and other parameters?
Also try to replace the 192.168.1.1 with the real DNS you get from your provider , maybe this will help. I had the same problems as you, but with FC1. While my Windows und Solaris systems resolve fast with my router as the DNS, my Fedora systems are just painfully slow with it, and can't resolve most .de domains. Changing the DNS solved the problem.
However I still don't know the real reason for it, so if there are any network gurus out there, please enlighten me