I don't know if the problem occurred with something in the upgrade, but since I could upgrade to sid from potato (installed from CD) via ftp, the problem was not present before the upgrade. Since this hasn't happened on any of my desktop computers, I can only assume it has something to do with the laptop.
The laptop: Dell Inspiron 8000: Xircom pcmcia nic The problem: I cannot access my gateway computer nor can it access my laptop, but I can access the other computers on my lan. Running "ifconfig" reveals a device listed which I have never seen before, "tap0", assigned the IP address of my gateway computer. I have tried marking it down, but something on the laptop still thinks a local IP is the same as my gateway IP even with tap0 down. I have checked /etc/networks/interfaces, /etc/pcmcia/network.opts, /etc/resolv.conf, /etc/hosts, and everything else I could think of that could be defining tap0 and/or convincing the laptop he is, in addition to his own IP, the IP of my gateway. Thank you in advance. I have found the archive for this list very helpful in setting up this laptop but didn't see anything like this (or just searched on the wrong thing) -TShrew