DHCP tied to one of two network adapters

I have an Iomega NAS server. It is running Windows 2000 Server. It has two

netowrk adapters. Is it possible to have the DHCP tied to only one of the

adapters? I have several old machines that I have to do file back-up on.

They range from MS-DOS 5.0 to Windows 98 / NT 4.0, IBM DOS, OS 2. I am no

longer allowed to have them on the factury network. I want to set up a

sub-network. I want the Iomega NAS to be a bridge between the subnetwork and

the main network. The subnetwork is configured to obtain and IP from the

main network when it was originally created. I want to continue this

function on the subnetwork.

What are my options?

Thank you.