Question : How to have system use only one DHCP server if there are two able to answer?

I know this is not a correct scenario for DHCP but the IT staff at my company (who shall remain nameless) has multiple subnets and there is a DHCP server on each subnet. So far so good but systems on these subnets can reach both DHCP servers and it's a crap shoot as to which IP scope they receive their address from.

The question is as above. How do I force a system to talk only to the DHCP server I want it too?

I was messing with the windows firewall but didn't make any head way...

the system is running win2k3 server.

Answer : How to have system use only one DHCP server if there are two able to answer?

You can't - when a machine sends out a DHCP discover packet it will respond to the first DHCP server to come back with an offer.

The only way is to
1. Stop DHCP crossing the subnets (usually a setting on the router)
2 Set up DHCP Class ID (this has to be set up on the DHCP servers), see http://thelazyadmin.com/blogs/thelazyadmin/archive/2007/02/08/DHCP-User-Classes.aspx