DHCP relay NAT allows clients to automatically obtain IP addresses and ping the extranet

First, the C1 and C2 VLAN are set on the switch R5

r5>en

R5#conf T

R5 (config) #vlan 10

R5 (Config-vlan) #vlan 20

R5 (Config-vlan) #inter FA1/1

R5 (config-if) #switchport Access VLAN 10

R5 (config-if) #inter FA1/2

R5 (config-if) #switchport Access VLAN 20

R5 (config-if) #inter fa1/0

R5 (config-if) #switchport mode trunk

R5 (config-if) #switchport Trunk Encapsulation D

R5 (config-if) #switchport trunk Encapsulation dot1q

Then set the DHCP address pool

dhcp>en

Dhcp#conf T

DHCP (config) #ip DHCP p

DHCP (config) #ip DHCP pool

DHCP (config) #ip DHCP pool v10

DHCP (dhcp-config) #netw

DHCP (dhcp-config) #network 192.168.10.0 255.255.255.0

DHCP (dhcp-config) #de

DHCP (dhcp-config) #default-router 192.168.10.1

DHCP (dhcp-config) #ip DHCP pool V20

DHCP (dhcp-config) #default-router 192.168.20.1

DHCP (dhcp-config) #network 192.168.20.0 255.255.255.0

DHCP (dhcp-config) #inter fa0/0

DHCP (config-if) #ip add

DHCP (CONFIG-IF) #ip address 192.168.100.100 255.255.255.0

DHCP (config-if) #no shut

DHCP (CONFIG-IF) #end

DHCP (config) #ip Route 0.0.0.0 0.0.0.0 192.168.100.10

DHCP (config) #do Ping 192.168.100.10

Sending 5, 100-byte ICMP Echos to 192.168.100.10, timeout is 2 seconds:

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