bill - 12:27 am on Mar 27, 2008 (gmt 0) Here's some info about ICS and Network Bridge setups:
It sounds like you need to enable Network Bridging along with the Internet Connection Sharing to get the home network functioning. I don't know if your router will work this way though. Normally you'd use a switch for something like this. According to this article [windowshelp.microsoft.com] ICS won't work with a router, but your setup is somewhat unique.
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Here's some info about ICS and Network Bridge setups: