I have a small home office network setup, using my Fedora Core 4 Linux box as a router using IPtables. I am ip masquerading my wife's Windows2k box and this seems to work fine. But, I want to serve a website from the win2k box. I have a Dyndns.org account -- a dynamic account since my DSL connection is not a static address. But, since the IP address that is fed to my dyndns account is the IP address of the DSL modem I am not getting through to either the FC4 or Win2k box. Instead if I web to my web address the DSL modem's web administration interface is displayed. How do I setup a dyndns account that will actually get to my win2k box? Any help is greatly appreciated.

I use Dynamic DNS to host my website at home on a linux box, however I use a hardware router that connects to the modem and the linux box connects to the router. What I do is to use port forwarding to ensure that when a request comes in for the webserver on port 80, it gets routed to the appropiate machine, this is done by specifying the IP address. I havent done this using a linux box as the router, but I am sure that port forwarding is possible on linux, best bet would be to google it.
Maybe this will help
http://www.wfu.edu/~mudayja/router.html