NAT – PAR configuration

Recently I have been practising NAT a lot , exploring many IOS options and configurations.

Imagine R2 is our telnet server and we need to configure R1 that when it receives packets destined for IP address of its Serial 0/0 interface for port 23 , it then redirects the traffic to our telnet server R2.

Please see below configuration:

R1#(config)#int f 0/0
R1#(config-if)#ip nat inside
R1#(config)#int s 0/0
R1#(config-if)#ip nat outside

R1#(config)#ip nat inside source static tcp 10.1.123.2 23 interface s0/0 23

R4#teln 131.1.14.1

Trying 131.1.14.1 ….Open

Username: R2
Password: R2

R2>

————————————————————————————————————————————————————————————–

Another similar scenario. Whenever R1 receives any traffic destined for the IP address of it’s S0/0 interface for ports 80 and 8080 then the traffic should be redirected to R3

R1#(config)#int f 0/0
R1#(config-if)#ip nat inside
R1#(config)#int s 0/0
R1#(config-if)#ip nat outside

R1#(config)#ip nat inside source static tcp 10.1.123.2 80 intre s0/0 80
R1#(config)#ip nat inside source static tcp 10.1.123.2 8080 intre s0/0 8080

 

R4#teln 131.1.14.1 80

Trying 131.1.14.1, 80 ….Open

 

Enjoy !

Tom