ipfw: ALLOWing by mac address

[Foo Ji-Haw]

Hello all,

I'd like your feedback on a problem I have with allowing access through the ipfw firewall via mac addresses.

Andrew has a good point on mac address spoofing. I agree with him on the security concern, but for the situation that I am setting up, that's ok. But I really need to open the firewall via mac address.

Let me detail my setup:
dc0 is the interface to the Internet
vr0 is the interface to the managed network

I tried to read up on ipfw rules on mac, and I got something like this:
allow ip from any to any MAC any 00:90:d1:00:80:00/33

It does not work of course, but ipfw accepted the command. Basically I need the client with the mac address to be able to go pass the firewall in totality.

Can anyone enlighten me on the correct format? Thanks in advance.