I've got the same problem. I've got samba working so i can mount network filesystems like this
mount -t smbfs -o username=blah,password=blah,domain=blah //2000server/shared /mnt/2000server/
or something similar i'm in windows now
but i dont know how to get on t'internet, the server returns "proxy authorisation required, the gateway cannot retrieve the requested page"
I dont show up in the network neighborhood either even though I can browse all the windows boxes whats that all about?