Cisco 800 series

NURDs Inventory
Owner	Space
Status	Infrastructure
Hostname	nurds-rtr-01
Location	machine room
Tool
Tool category

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Description

Our main router for internet access is a Cisco 800 series.

Port forwarding howto

Log in with root on 172.31.255.2 (Why?)

enable
show config

Currently forwarded ports are listed in the lines beginning with "ip nat inside source static"

config terminal

Now add a new line similar to the existing ones, for example:

ip nat inside source static tcp <internal ip> <internal port> <external ip> <external port> extendable
<enter>
<ctrl>+z
write memory

Check your result with

show config

Remove existing port forwarding rules

Copy a rule from "show config" and paste "no" in front of it.