Solved

NAT Cisco 1841

Posted on 2010-11-15
1
528 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 500 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

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Home network with two AP's dropping WiFi connectivity 12 68
Cisco WRVS4400N 11 37
Blacked by spamhaus? 26 69
VPN Ports 8 30
How to set-up an On Demand, IPSec, Site to SIte, VPN from a Draytek Vigor Router to a Cyberoam UTM Appliance. A concise guide to the settings required on both devices
In this article, I am going to show you how to simulate a multi-site Lab environment on a single Hyper-V host. I use this method successfully in my own lab to simulate three fully routed global AD Sites on a Windows 10 Hyper-V host.
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

856 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