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NAT on Cisco 1720

Posted on 2002-03-08
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Last Modified: 2010-04-17
Sitting behind a Cisco 1720 router is my server with the IP address 192.168.0.231. I want to enable the following application using port mapping / NAT.

- PCANYWHERE
- MSN
- IIS 5.0 (setting up a web-server)

I know the details of port used in the above applications. I need help in how to accomplish the task in Cisco IOS?
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Question by:DXB
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scraig84 earned 10 total points
ID: 6850276
Take a look at this link:

http://www.cisco.com/warp/public/556/index.shtml

This is basically your "get everything here" for NAT info.  If you still need specific help beyond that, let us know.
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by:DXB
ID: 6850290
Well, I'll like to have my cake in plate :) Can I have the commands that I can run!
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by:scraig84
ID: 6850353
Do you already have NAT functioning for outside access, such as for browsing etc from the private network?  If that is already set up and you just need to create the static NAT rules for inbound access, it would be something like:

ip nat inside source static tcp 192.168.0.231 80 209.1.1.1 80

where 209.1.1.1 is the public IP.  This would map port 80 to port 80 on the inside, but you could easily change the port numbers on the inside if you wanted to.

If you do not already have translation of any kind working, you will need to set up dynamic NAT:

ip nat pool funky 209.1.1.1 209.1.1.1 netmask 255.255.255.248 overload
ip nat inside source list 1 pool funky
access-list 1 permit 192.168.0.0 0.0.0.255

interface e0
ip nat inside

interface s0
ip nat outside

This example will PAT the external address 209.1.1.1 and allow all hosts on the 192.168.0.0 range to use the PAT address.  I had to guess on the network masks as I do not know the size of the networks your interfaces belong to.
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by:Asta Cu
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Points to scraig84
Asta
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