Network Address Translation (NAT)

R1(config)#int lo0

R1(config-if)#ip add 10.0.0.1 255.0.0.0

R1(config-if)#no shut

R1(config-if)#ip nat inside

R1(config-if)#exit

R1(config)#int fa0/0

R1(config-if)#ip add 200.0.0.1 255.255.255.0

R1(config-if)#ip nat outside

R1(config-if)#no shut

R1(config)#ip nat inside source static 10.0.0.1 200.0.0.2

R1#sh ip nat translations

Pro Inside global      Inside local       Outside local      Outside global

--- 200.0.0.2          10.0.0.1           ---                ---

R1#ping

Protocol [ip]:

Target IP address: 200.0.0.10

Repeat count [5]:

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]: y

Source address or interface: 10.0.0.1

Type of service [0]:

Set DF bit in IP header? [no]:

Validate reply data? [no]:

Data pattern [0xABCD]:

Loose, Strict, Record, Timestamp, Verbose[none]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 200.0.0.10, timeout is 2 seconds:

Packet sent with a source address of 10.0.0.1

..!!!

R1(config)#no ip nat inside source static 10.0.0.1 200.0.0.2

R1#ping

Protocol [ip]:

Target IP address: 200.0.0.10

Repeat count [5]:

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]: y

Source address or interface: 10.0.0.1

Type of service [0]:

Set DF bit in IP header? [no]:

Validate reply data? [no]:

Data pattern [0xABCD]:

Loose, Strict, Record, Timestamp, Verbose[none]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 200.0.0.10, timeout is 2 seconds:

Packet sent with a source address of 10.0.0.1

.....