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Subnet F
DHCP relay agent
Figure 9-35
Network topology with DHCP Relay Agent
In the network, clients on all subnets except D and E will be able to obtain an IP address from the DHCP server on Subnet C:
Subnet A contains a DHCP relay agent. If we assume that the DHCP relay agent is configured to point toward the IP address of the DHCP server on Subnet C, DHCP clients on Subnet A will be able to obtain an address from this server. Subnet B does not contain a DHCP server or a DHCP relay agent. However, the DHCP Discover broadcasts from clients on Subnet B are able to pass through the RFC 1542 compliant router (provided that BOOTP forwarding has been enabled). Therefore, the DHCP client requests on Subnet B are received by the DHCP server on Subnet C. This DHCP server can then answer these requests accordingly.
Lesson 4
Configuring and Managing Routing Protocols
9-65
Subnet C contains a DHCP server. Clients on this subnet will be able to receive an address from the DHCP server directly. Subnet D does not contain a DHCP server or a DHCP relay agent. Although one of its routers is 1542-compliant, this only helps pass DHCP request broadcasts to another subnet that does not have a DHCP server or a DHCP relay agent. As a result, clients on Subnet D will not be able to obtain an address from the DHCP server on Subnet C. Subnet E, like Subnet D, does not contain a DHCP server or a DHCP relay agent. The 1542-compliant router does not allow the clients on Subnet E to connect to a DHCP server. Subnet F is configured with a DHCP relay agent. If the relay agent is configured with the address of the DHCP server on Subnet C, the clients on Subnet F will have their DHCP requests intercepted by the DHCP relay agent and answered by the DHCP server.
Note
You cannot use the DHCP Relay Agent component on a computer running any of the following: the DHCP service, the NAT routing protocol component with automatic addressing enabled, or ICS.
Configuring the DHCP Relay Agent
To configure the DHCP Relay Agent, first add the DHCP Relay Agent routing protocol to the Routing And Remote Access console. To add the DHCP Relay Agent, complete the following steps: 1. Open the Routing And Remote Access console. 2. In the console tree, right-click the General node, and then click New Routing Protocol. 3. In the New Routing Protocol dialog box, click DHCP Relay Agent, and then click OK. Second, configure the DHCP Relay Agent to point to the address of at least one remote DHCP server. (More than one DHCP server can be used for fault tolerance.) This configuration is achieved through the DHCP Relay Agent Properties dialog box, shown in Figure 9-36. To configure global DHCP Relay Agent properties, complete the following steps: 1. Open the Routing And Remote Access console. 2. In the console tree, right-click the DHCP Relay Agent node within IP Routing, and then click Properties.
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Routing with Windows Server 2003
3. On the General tab, in the Server Address text box, type the IP address of your DHCP server, and then click Add. 4. Repeat step 3 for each DHCP server you need to add, and then click OK.
Figure 9-36
DHCP Relay Agent properties
Third, enable the protocol on the interface or interfaces pointing to the network seg ment containing the DHCP clients. To enable the DHCP Relay Agent on a router interface, complete the following steps: 1. Open the Routing And Remote Access console. 2. In the console tree, right-click the DHCP Relay Agent node, and then click New Interface. 3. Click the interface you want to add, and then click OK. 4. In the DHCP Relay Properties dialog box, on the General tab, verify that the Relay DHCP Packets check box is selected. 5. If needed, in Hop-Count Threshold and Boot Threshold (Seconds), click the arrows to modify the thresholds.
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