Can iptables do this?

["Wei Ming Long" <WEI_Ming_Long@dsi.a-star.edu.sg>]

Hi Everyone,
I have posted this question before but got no response, so I'm posting it
again, please pardon me if you have seen this before.
I have a wireless network with my linux machine as a gateway between the
internet & my internal wireless network. I have iptables running on the
gateway & also a dhcp server to serve out ip addresses to the client laptops.
I also run the Squid proxy server on the gateway to proxy http requests. I use
iptables to redirect http traffic to Squid and to do nat for the internal
network.
My question is this: what if a laptop with a preconfigured static ip address
comes into the internal network or worse, 2 client laptops with identical
preconfigured static ip addresses enter into network, can iptables do nat
based on mac address <--> public ip address mapping besides the usual private
ip address <--> public ip address mapping?

Please help. Thanks.

Best regards
Matthew