MAC Addr Cloning

[Thomas Smith]

FreeBSD 4.8-RELEASE

I have a Cox Internet connection that I currently use a Netgear router 
with. I'd like to hook my FreeBSD box to that connection and use it 
instead. The problem is that Cox provisions accounts and if the MAC 
address changes they have to be called to reprovision the account.

What I'd like to do is configure one of my NICs to clone the MAC of the 
router. How is this done in FreeBSD?