Quick steps to configure a Cisco router, up and running in no time!

Configure IP for WAN & LAN interfaces

ip address 202.xxx.xxx.x 255.255.255.240
ip address 192.168.100.1 255.255.255.0

Define outside interface for NAT (WAN)

R1(config)#interface serial0/x
R1(config-if)# ip nat outside

Define inside interface for NAT (LAN)

R1(config)#interface gi0/x
R1(config-if)# ip nat inside

Create an Access Control List (ACL) that will include local (private) hosts or network(s) to be translated

R1(config)#access-list 100 permit ip 192.168.x.0 0.0.0.255 any

Finally enable NAT overload to WAN interface with the above ACL

R1(config)#ip nat inside source list 100 interface serial0/x overload

Verify NAT overload operation

R1#show ip nat translations

Clear NAT table to free up resources

R1#clear ip nat translation *

show NAT statistics

R1#show ip nat statistics

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