How to Configure DHCP Using Subnets
Dynamic Host Configuration Protocol (DHCP) is the protocol that automatically assigns IP addresses to computers connecting to a network. Typically, DHCP networks are set up with one or a few subnets in the same class or range. Heterogeneous subnets require their own DHCP servers but can be managed under the same router, using a smart management protocol that automatically assigns new hosts to the appropriate subnet in order to conserve bandwidth and IP addresses. This is called DHCP relay and is useful in large organizations.
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Instructions
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Configure one server instance for each subnet, then select the server with the most bandwidth or resources to fulfill the role of the DHCP Relay Agent Server. This server must be connected directly to the router.
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Click "Start," "Administrative Tools," then "Routing and Remote Access." Right-click your planned DHCP server in this view and select "Configure." Select "Custom Configuration" and check "LAN Routing." Click "OK" to start the RRAS service.
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Return to the "Routing and Remote Access" applet, then expand the server. Right-click "IP Routing," then select "New." Select "DHCP Relay Server" from the Routing Protocol pop-up. Expand the "DHCP Relay Server" in the "Routing and Remote Access" applet and double-click for "Properties." Click the "General" tab and add the IP address of each member DHCP server to allow them to be relayed by this master server, allowing multiple subnets over a common network.
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