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Lab 1.2.8 Configuring DHCP Relay

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A DHCP client uses IP broadcasts to find the DHCP server. However, these broadcasts are not forwarded by routers, so in the case of the remote LAN, the workstations will not be able to locate the DHCP server. The router must be configured with the ip helper-address command to enable forwarding of these broadcasts, as unicast packets, to the specific server. Routing between the remote router and the campus router is done using a static route between the remote router and gateway router, and a default route between the gateway router and remote router | Cisco SrsTEMS Lab 1.2.8 Configuring DHCP Relay Router 1 Router 2 cisco Straight-through cable Serial cable Console rollover Crossover cable cisco Router 2 DTE 172.16-1.5 30 class DCE 172.16.1.6 30 class Remote 172.16.13.1 24 Router 1 Campus 172.16.12.1 24 Router Router FastEthernet 0 Address Interface Serial 0 Designation Name Subnet Mask type Address Enable Secret Enable VTY Password Console passwords Objective A router will be configured for Dynamic Host Configuration Protocol DHCP . The ability for workstations to remotely obtain DHCP addresses will be added. Addresses will be dynamically assigned to the attached hosts. Background Preparation A DHCP client uses IP broadcasts to find the DHCP server. However these broadcasts are not forwarded by routers so in the case of the remote LAN the workstations will not be able to locate the DHCP server. The router must be configured with the ip helper-address command to enable forwarding of these broadcasts as unicast packets to the specific server. Routing between the remote router and the campus router is done using a static route between the remote router and gateway router and a default route between the gateway router and remote router. Cable a network similar to the one in the diagram above. Any router that meets the interface requirements displayed on the above diagram may be used. This includes the following and any of their possible combinations 800 series routers 1 - 6 CCNA 4 WAN Technologies v 3.0 - Lab 1.2.8 Copyright 2003 Cisco Systems Inc. 1600 series routers 1700 series routers 2500 series routers 2600 series routers Please refer to the chart at the end of the lab to correctly identify the interface identifiers to be used based on the equipment in the lab. The configuration output used in this lab is produced from 1721 series routers. Any other router used may produce slightly different output. Conduct the following steps on each router unless specifically instructed otherwise. Start a HyperTerminal .

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