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jacktrades
Asked: 2014-06-19 08:27:35 +0800 CST

Port Forwarding on Cisco Router

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I'm a Cisco newbie, have the 1841, with two ethernet interfaces:

interface FastEthernet0/0: Internal
Desired destination IP: 186.67.181.140

interface FastEthernet0/1: External World
 IP 186.67.181.140

Want to make a HTTP port forwarding from External World to Internal IP.

Tried adding this rule, but does not make the forwarding:

ip nat inside source static tcp 192.168.1.20 80 186.67.181.140 80 extendable

Any idea why I don't get the port forwarding right?

Complete configuration:

interface FastEthernet0/0
 ip address 192.168.0.1 255.255.255.0 secondary
 ip address 192.168.1.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
!         
interface FastEthernet0/1
 ip address 186.67.181.140 255.255.255.248
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
!         
ip classless
ip route 0.0.0.0 0.0.0.0 186.67.181.141
no ip http server
no ip http secure-server
ip nat inside source list 100 interface FastEthernet0/1 overload
ip nat inside source static tcp 192.168.1.20 80 186.67.181.140 80 extendable
!         
!         
access-list 100 permit ip any any
access-list 111 permit ip 192.168.1.0 0.0.0.255 any
access-list 111 permit ip 192.168.0.0 0.0.0.255 any
cisco

1 Answers

  1. Best Answer

    The problem was in my destination, different from cisco router.

    To check if your cisco router is making port forwarding you do:

    Router#sh ip nat trans | i 80

    Then check if there is an entrance similar to this:

    tcp 186.67.181.203:80  192.168.1.20:80    85.72.43.64:51720  85.72.43.64:51720

    If it's there, it's making the port forwarding.

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