I've got an old-fashioned Asanté 8 port hub that both our computers and the cable modem plug in to. We pay Comcast for an extra IP.
5 years ago when I got the cable modem, this was the best solution because we used several programs (eg CU-SeeMe) that use UDP and didn't play nice with NAT. Not the case any more but the inertia of a system that works has kept me from changing it up.
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