Originally Posted by ScottC
The best way to share a folder to the outside world is to setup a simple VPN connection to your XP box. In the XP connection wizard you can set things up to accept incoming connections from the outside world. You'd need to open up some ports on your router, but it'll be much more secure than most other options.
You could also consider a simple FTP server on the machine to do the same.
Actually, the modem IP has very little to do with anything - it's the CPE (PC or router) IP address that needs to be fairly static in order for you to do this. I can tell you this:
1) Do NOT assign yourself a static IP. Comcast uses "cable source verify" to catch people using static IP's
2) The modem and cable interface of the CMTS have IP filters and ACLs in place to block ports 80, 21 444, and the Netbios ports. With those blocked, you will need to use a VPN client in order to allow shares.
hope this helps
Jim