DHCP multiple subnets

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Dear NG, here is another one...

We have a W2k3 server setup in a school acting as a DC, File server and
DHCP, the server is obviously not connected to the internet because we need
to make sure that no student has access to the web, not psychically nor
technically even DHCP is configured to hand out blank gateways, we want
however to have the ability to manage and support the server remotely so we
decided to attach the second nic to the administration network (on a
separate DC also providing DHCP) which has a DSL line, here is what im
thinking of doing it...

* the student subnet on nic one is 192.168.20.x
* the administration subnet on nic two is 192.168.1.x
*DHCP on the student server has a scope of 192.168.20.100-192.168.20.199
* Routing and remote access is disabled on the student server

*NIC config on the student server*
NIC 1 - Stdent network
IP= 192.168.20.250
SM= 255.255.255.0
GW= empty!
DNS = 192.168.20.250

NIC 2 - Administration network
IP= 192.168.1.250
SM= 255.255.255.0
GW= 192.168.1.1
DNS= ?

when preforming a quick test i ened up having a few machines in the
administration office with an ip of192.168.20.x (obviously causing it to
lose network connection to their own server) because it was picking up DHCP
from the wrong server, can I tell DHCP to respond to DHCP request only on
NIC 1 and if not any other recommendations?

thanks





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