DHCP2路由器：
Router>en
Router#conf t
Router(config)#interface f0/0
Router(config-if)#ip address 200.1.1.2 255.255.255.0
Router(config-if)#no shutdown
Router(config-if)#exit
Router(config)#hostname dhcp2
dhcp2(config)#
dhcp2(config)#ip route 192.168.2.0 255.255.255.0 200.1.1.1
dhcp2(config)#ip dhcp pool p2
dhcp2(dhcp-config)#network 192.168.2.0 255.255.255.0
dhcp2(dhcp-config)#default-router 192.168.2.254
dhcp2(dhcp-config)#dns-server 222.222.222.222
在DHCP1上做DHCP中继：
dhcp1(config)#interface f0/1
dhcp1(config-if)#
dhcp1(config-if)#ip hel