network config with two network cards as route to gateway

[david at thekramers.net (David Kramer)]

Derek Martin wrote:

> ISC's dhcpd allows the administrator to assign static IPs based on MAC
> address.  Under such circumstances, if your dhcpd is assigning
> something other than the IP address you so specify, then either your
> configuration has some kind of problem, or something is very, very
> wrong.  I've used this for years and never had a problem with a
> mis-assigned IP address (except when an engineer swapped out a NIC and
> didn't tell anyone)...

I've been looking at the man page and can't see how to do that.  Can you show 
me an example?