Auto IP configuration

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

Hi everyone,
I am thinking of setting up a wireless lan and hope to use my laptop as
wireless client with dynamic ip address, using dhcp & running netfilter on the
gateway. I use my laptop at office with a static ip address and configured
proxy server. My question is: Can netfilter do nat or packet filtering based
on mac address so that I do not have to change my network configurations each
time my network environment changes. 

Scenario 1 - With only my laptop

Internet ------------- Linux Gateway (ip address = 192.1681.1, Netfilter +
DHCP + Squid) -------------- My laptop A (ip address = 192.168.1.1)(dynamic)

Scenario 2 - With my laptop & a friend's laptop

Internet ------------- Linux Gateway +-------------- My laptop A (ip address
= 192.168.1.1) (dynamic)
                                  +
                                   |
                                   |
                                   |
                        Friend's laptop B (ip address = 172.16.1.1)
(static),

All help greatly appreciated. Thanks.

Best regards
Matthew