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NAT Cisco 1841

Posted on 2010-11-15
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Last Modified: 2012-05-10
I have an Cisco 1841 performing NAT for part of my internal network.  when I am on the internal side, I cannot browse to the WAN address of the NAT.  everything else works fine, and you can browse to the WAN side of the NAT as long as you are not coming from behind the NAT. Im assuming i need a loopback setup somewhere, but am not sure how to get the job done.
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Question by:HunTelWebProgrammer
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Faruk Onder Yerli earned 2000 total points
ID: 34137682
NAT operations start after internal routing operations. that means,

if NAT operation is exists packet travel will be below.
recevie packet from int. -> check NAT operation -> check destination -> make NAT -> put out interface

if NAT operation is not exists packet travel will be below.

recevie packet from int. -> check internal route -> check external route -> put out interface .

Cisco routers make NAT operations whlie packet is going out from interface. This means all nat operation are interface based. Because of it you can not create correct DMZ network and both way NAT operations on cisco routers. It is valid for router interfaces. You may reach other ip address over NAT which is connected NAT ip address range.
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