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IPSEC Pass Through, and NAT on a Cisco 3640 Router

Posted on 2004-11-02
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Last Modified: 2008-02-26
Hi all,

I have been reading a lot of questions and answers here regarding IPSec, and NAT and still a bit confused. I have a Cisco 3640 Router as my gateway, and have NAT configured, some static mappings as well as dynamic.
IOS Version: 3600 Software (C3640-JK9O3S-M), Version 12.2(13)

I am looking for how to allow IPSEC Pass through on the router with NAT?  I do have some ACL's applied, and looking for either some help with the config, or a url , pointer to look at and read up on it.

I can post part of the config file if needed, just need to know what parts would be pertinent.

Thanks in advance for the help.
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Question by:orbix
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lrmoore earned 2000 total points
ID: 12478175
You're looking for a feature called "nat transparency" that may or may not be available in your IOS version:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080110bca.html

You probably need the "T" train IOS version...or 12.3


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Author Comment

by:orbix
ID: 12500883
Lrmoore, thanks for the URL, I have been reading up on this, and you are correct that my current IOS will not support this. Once I am able to upgrade the IOS, I will be able to impliment this, thanks for your help.
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