[CentOS] Restricting dhcpd to an interface

I want to run dhcpd on my notebook to support test systems connecting on 
a separate interfaces.

I have looked at both the dhcpd and dhcpd.conf man pages and did not 
find an 'interface' option.

I will have 3 interfaces on my notebook.  One for the notebooks network 
access and two for test systems.  I want to serve different subnets on 
each of those interfaces, and have not figured this out yet.