The advice you're getting is correct - you need a router, not a regular hub/switch. What you're wondering, about plugging your modem into the NIC on your 'main' computer, then sharing that out through a second NIC to your hub and from there to one or more computers, that is also quite possible. I've been doing this for years now with NAT32, except I'm using an old slow computer with a NIC and a modem, which sits in the cellar and never gets rebooted (W98, runs for months on end). Using your main computer with two NICs is quite reasonable, the NAT process uses very little resources, won't slow things down (much). With most current OS's you really shouldn't need NAT32 - Windows from 98SE onwards will do Internet Connection Sharing (ICS). Do remember, with whichever route you take, that you will need a firewall.