Originally posted by AKIron
A DSL modem will not directly support two computers. But don't get dismayed. There are several ways to skin this cat. You got two network cards and some cable right? No hub? You're going to need either a hub/switch (cheap as $20) or a router (cheap as $40). The router has a built in hub/switch and is the best way by far to go. However, if you're as tight as my Dad and want to save that $20 you can connect the dsl modem to the $20 hub and then both PCs to that same hub. To do internet sharing you'll need to choose a PC to be the "primary" sharing PC. The 2nd PC will not connect unless the "primary" PC is up and running. You can then use the primary pc as your router/gateway. I won't go into the specifics unless you really want to go this way, which I don't recommend btw.
The modem my first ADSL ISP sent me was a DLink DSL200. I'm still using it. But Iron, there is some confusing stuff around on the web about all this which suggests that you need
two network cards. You do not - only one is needed. You need 2xNIC, but the DSL modem is acting as one NIC. Trust me, Tomato and I have this thing set up perfectly with just one network card. And on this mobo, I could even get rid of that. BTW, I'd like to meet your Dad.

The host firewall settings need to define the host computer as a gateway to the internet.