Public IP & NAT

rsabapathee · ‎04-04-2008

Our ISP has provided us with a public IP.

I have connected their Modem of a Cisco router 1710, and the second port (FastEthernet) to our internal network.

I have Natted the public IP to one of the PCs inside our network, so that the outside world can reach the PC.

Is it possible that a connection on a specific port on the public IP addr. is natted to a second PC.

eg:

http://'IP Address':8080 goes to PC1

http://'IP Address':8000 goes to PC2

How to configure the router?

thx

cisco24x7 · ‎04-04-2008

interface F0/0

description connection to ISP

ip address 1.1.1.1 255.255.255.252

ip nat outside

interface F0/1

description Internal LAN

ip address 192.168.1.1 255.255.255.0

ip nat inside

access-list 100 permit ip 192.168.1.0 0.0.0.255 any

ip nat inside source list 100 interface F0/0 overload

ip nat inside source static tcp 192.168.1.10 8080 interface FastEthernet0/0 8080

ip nat inside source static tcp 192.168.1.20 8000 interface FastEthernet0/0 8000

where

192.168.1.10 = PC1

192.168.1.20 = PC2

CCIE Security