Perhaps this?
Note that to enable Internet Connection Sharing, the Windows XP-based
computer must have two connection devices. One device for the home
network or small-office network, such as a network adapter, and one
device for the Internet Connection, such as a modem or dedicated network
adapter.
How to enable Internet Connection Sharing on a home or a small office
network connection in Windows XP
http://support.microsoft.com/kb/314066
yawnmoth wrote:
> If I click on the Advanced tab of my "Local Area Connection", I don't
> see the "Allow other network users to connect through this computer's
> internet connection" checkbox. Any ideas?