CCNA ICND1 Lab6 - Configuring Dynamic NAT

NAT provides almost unlimited address space and avoids internal network addressing schemes to implement easy management of addresses. NAT controls the traffic into and out of the internal network.

Topology:

Lab Requirements:

1. Two private IP addresses can access the Internet through two public IP addresses by using NAT.

2. Any other private IP addresses cannot access the Internet.

Note:

1. A 2600 series router is used as an edge router.

2. The two public IP addresses are 202.119.249.251 and 202.119.249.252.

Lab Process:

P4S-R(config)#interface fastethernet 0/0

P4S-R(config-if)#ip nat inside     / Specify the inside interface

P4S-R(config-if)#ip address 192.168.1.1 255.255.255.0

P4S-R(config-if)#no shutdown

P4S-R(config-if)#exit

P4S-R(config)#interface S1/0

P4S-R(config-if)#ip nat outside     / Specify the outside interface

P4S-R(config-if)#ip address 202.119.249.251 255.255.255.0

P4S-R(config-if)#no shutdown

P4S-R(config-if)#exit

P4S-R(config)#ip route 192.168.1.0 255.255.255.0 202.119.249.2    / Set the static route directed to the external network

P4S-R(config)#access-list 1 permit 192.168.1.0 0.0.0.255    / Create a standard access list and specify the range of the private network

P4S-R(config)#ip nat pool router 202.119.249.251 202.119.249.252 netmask 255.255.255.0   / Create address pool router and specify the range of the public network

P4S-R(config)#ip nat inside source list 1 pool router