Quote:
You set up the subnets in the DHCP server.

No. A DHCP server does not define your network any more than a computer with a static IP address defines your network. You have to make sure that the DHCP server is handing out IP addresses within the range defined by your existing IP network configuration, but it does not define the network itself. The network is defined logically; it's not really defined by any configuration file. You just have to make sure that all IP addressing configuration, whether via DHCP, static IP address assignment, routers, other routing, etc. all confirm to the plan you've made.
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Bitt Faulk