said by shorun:
The 4100 gave me a bunch of problems though. When I would fire up certain games or run NMAP it would flip out and log me off. I'd have to power cycle my modem and firewall, and then go to the web interface and click "Connect". Huge pain... works fine now
Do not use ppp on the modem. Get one that has line statistics, put it in a bridge mode, and use one of many techniques to access it in front of the firewall.