Alan,
You might want to check out this windows XP ICS setup article
http://www.microsoft.com/WindowsXP/pro/using/howto/networking/ics.asp
When you enable ICS, the local area network connection to the home or small
office network is given a new static IP address and configuration.
Consequently, TCP/IP connections established between any home or small
office computer and the ICS host computer at the time of enabling ICS are
lost and need to be reestablished. For example, if Internet Explorer is
connecting to a Web site when Internet Connection Sharing is enabled,
refresh the browser to reestablish the connection. You must configure client
machines on your home or small office network so TCP/IP on the local area
connection obtains an IP address automatically. Home or small office network
users must also configure Internet options for Internet Connection Sharing.
To enable Internet Connection Sharing (ICS) Discovery and Control on Windows
98, Windows 98 Second Edition, and Windows Millennium Edition computers, run
the Network Setup Wizard from the CD or floppy disk on these computers. For
ICS Discovery and Control to work on Windows 98, Windows 98 Second Edition,
and Windows Millennium Edition computers, Internet Explorer version 5.0 or
later must be installed.
cheers,
Ben