SBS Network, 2 Nics, How to turn on DHCP on local network?



I've already spent time Googling for an answer to this, so I apologize
if this question has an easy answer (it must).

I'm working with a network with SBS, where the SBS has two NICs, one
for the internet, one for the local network. I inherited this network
and have found it has issues with two clients simultaneously trying to
access a disk mounted on the SBS (causes problems with printing among
other things).

The local NIC connects to a D-link router WAN port, and on the other
side we plug in our switch to the desktop computers and also it has a
WAP. The D-link is currently doing DHCP for us. We're using the
subnet 192.168.1.X. The local NIC on the SBS is 192.168.0.1, and the
WAN on the D-link is set to 192.168.0.20.

Clients on the network access the internet just fine and can access
the SBS-mounted disk just fine as long as only one does at a time.
But if two try at the same time, one fails with the message "The
specified network name is no longer available".

After trying several things, turned off DHCP on the router and used it
as a switch then assigned manual IP addresses to two clients
(192.168.0.100 and 192.168.0.101) When I do that, the clients can
access the server just fine.

It's been suggested to me that we have SBS do the DHCP not the D-link
router. DHCP seems to be running, but when I simply attach the
clients to the server via the switch/router, it doesn't dish out
addresses. I'm really not familiar with SBS. Is there some obvious
thing I must do to turn on DHCP for the local NIC? Or, is there
something else I might change in my configuration to fix this problem.

Much thanks in advance for your help.

Andrew
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