In this example I will how you how to force dhcpd to bind to a individual interface, or multiple interfaces. I am using Debian 5 in this example.
From /etc/init.d/dhcp3-server
You will notice this variable $INTERFACES is refrenced but never used anwhere else. It is there for you to tell dhcpd which interface to listen on. You can also add in multiple interfaces there, separated by a space.
INTERFACES=”eth1″