?
Solved

NAT Cisco 1841

Posted on 2010-11-15
1
Medium Priority
?
536 Views
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.
0
Comment
Question by:HunTelWebProgrammer
1 Comment
 
LVL 12

Accepted Solution

by:
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.
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

During and after that shift to cloud, one area that still poses a struggle for many organizations is what to do with their department file shares.
This month, Experts Exchange’s free Course of the Month is focused on CompTIA IT Fundamentals.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question