Setting up DHCP relay on a Cisco router

This came up for me recently. Here are the commands to setup DHCP relay on a Cisco router, it’s super easy if you know what to do.

The interface you are configuring is the interface where the DHCP clients are located. The helper-address is the IP address of your DHCP server, in this case 10.10.0.5. Please note you will need to make this configuration change on EVERY interface that has clients that will need to access the DHCP server.

router2# conf t
router2(config)# int e0
router2(config-if)# ip helper-address 10.10.0.5