[lug] DHCP surrogate?

[D. Stimits]

I am wondering something about DHCP, while figuring out the best ways to 
add the cable modem network for 3+ computers to share (independently, 
and simultaneously). If 3 DHCP addresses are paid for, but the three 
machines behind the linux bridge turn off or on randomly, then in theory 
the address issued by the DHCP can change between reboots. If the linux 
bridge/firewall/filter (up 24/7) were to somehow be able to remember the 
MAC address of machines which previously were attached, and provide a 
fake "stub" MAC address for machines that shut down, then the IP address 
could be held all of the time. Does anyone know if it is possible for a 
bridge or gateway to act as a holding stub for DHCP addresses when the 
machines that really used the address shut down? It isn't necessary, but 
could be useful.

D. Stimits, stimits AT idcomm.com