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How to solution ipsec vpn client pass nat network ?

My vpn client is cisco vpn client 3.6,and my vpn server is

ipsec cisco 2600 router.

If client have a public ip address,then they work correct,

but if client on the pix inside,pix work with port nat ,

then the vpn client cann't work.

Can anybody know what cisco's ios feature support vpn client work under nat ?

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Re: How to solution ipsec vpn client pass nat network ?

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080110bca.html#1027258

Nat-traversal is an IETF draft standard that cisco supports on pixen, IOS, and vpn 3000 concentrators.

You need to be running 12.2(13)T IOS or higher. What IOS are you running?

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