Windows Vista : Windows Live OneCare : Configure firewall : This network is in Home or Work. Your PC can bee seen by other PCs, and your PC can see other PCs and devices.

Picture: In Windows Live OneCare, if the network location (zone) is Home or Work,
Network Discovery, File and Printer Sharing, and Internet Connection Sharing
are turned On by default.

Back to Direct Ethernet Connection tutorial:
Internet Connection Sharing (ICS) setup : part 1