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VPN to a PIX (6.3.1) Behind NAT Device

I have a VPN Set up from a PIX behind a NAT device running 6.3.1 to a VPN Concentrator. The lan to lan VPN works fine (connecting as base group to the concentrator).

Now, I would like to do two things. First, I would like to terminate client sessions to the PIX. I have passed UDP 500 and 4500 through the NAT device provided by my ISP (Broadmax DSL Modem/Router), but cannot get the VPN Client to connect. I do have "isakmp nat-traversal" turned on.

I would also like to do a true lan to lan with shared key, but am not sure I can originate from the VPN 3000 side if the PIX side is behind a NAT device.

Will either of these scenarios work?? If so, what do I need to do to get them to work??

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Re: VPN to a PIX (6.3.1) Behind NAT Device

This doc seems to have a similair topology to your requirement, take a look,

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a008009486e.shtml

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