Multiple Subnet DHCP

[Dean Maluski <dmaluski n1ety com>]

We are upgrading at work from a single subnet to 4 subnets. I need to
have my Linux box assign DHCP leases on two of the subnets. The only
good information I've found on this is sparse in TCPIP Administration
book. It says that the DHCP server must be aware of all subnets behind
router.
Where do I make it aware?
The sample DHCP.config file in the book shows how to setup two ranges on
two subnets but nowhere does it show any subnets that will be statically
assigned.
We will be using Cisco VLAN to do the routing. My understanding of this
is sparse. Someone else is setting that up. My task is getting the
server to handle the DHCP part of it. 
-- 
Dean Maluski
http://n1ety.com