On Friday 12 April 2002 11:49 am, nate at refried.org wrote: > On Fri, Apr 12, 2002 at 11:27:06AM -0500, Scott Raun wrote: > > How do they control that? How do they limit 3 DHCP IP's to a > > household? The only way I can think of is to limit them by MAC. > > attbi.com matches your cable modem MAC and the MAC of the computer > connected to it before giving you an IP. You have to tell them each > time you change one of those. > That is, as far as I can tell, an argument in favor of Roadrunner; if you mess with your system, you don't have to negotiate with them over a new MAC. That said, if you're using one of the dedicated router/firewall boxes, you're probably not going to be changing the MAC, which will be of the router/firewall box, rather than the computer. (Quibble: the MAC address is that of the NIC card or other device that connects to the cable modem, not the computer.)