Cisco IOS Configure DHCP Relay with IP Helper Address
Network Topology
Router1 Configuration Commands
Router1>enable
Router1#configure terminal
Router1(config)# interface fastEthernet 0/0
Router1(config-if)#ip address 172.16.1.1 255.255.255.0
Router1(config-if)#no shutdown
Router1(config-if)#exit
Router1(config)#service dhcp
Router1(config)#ip dhcp pool MAIN-POOL
Router1(dhcp-config)#network 192.168.10.0 255.255.255.0
Router1(dhcp-config)#default-router 192.168.10.1
Router1(dhcp-config)#dns-server 192.168.10.2
Router1(dhcp-config)#exit
Router1(config)#ip dhcp excluded-address 192.168.10.1 192.168.10.10
Router1(config)#ip route 192.168.10.0 255.255.255.0 172.16.1.2
Router0 Configuration Commands
Router0>enable
Router0#configure terminal
Router0(config)# interface fastEthernet 0/1
Router0(config-if)#ip address 172.16.1.2 255.255.255.0
Router0(config-if)#no shutdown
Router0(config)# interface fastEthernet 0/0
Router0(config-if)#ip address 192.168.10.1 255.255.255.0
Router0(config-if)#ip helper-address 172.16.1.1
Router0(config-if)#no shutdown
Router1 DHCP Commands
Router1>enable
Router1#show ip dhcp pool MAIN-POOL
Router1#show ip dhcp binding
