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VPN Gateway-to-gateway trough NAT

dtorre
Level 1
Level 1

‎10-21-2002 05:39 AM - edited ‎02-21-2020 12:08 PM

Hi, I have 2 remote offices facing the Internet each with 1 PIX (6.2) and I would like to connect the 2 networks with a VPN gateway-to-gateway.

The problem is that one pix is behind a natting router (not controlled by my organization). A VPN client-to-gateway (the client is behind the NAT) is currently working but a VPN gateway-to-gateway is a different thing.

Do you think there is a way to have it working in this configuration?

Thanks in advance.

C.

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rrbleeker
Level 1
Level 1

‎10-21-2002 08:17 AM

If your Client-Gateway connection is going to the same Gateway as your Gateway-Gateway connection, you might have a problem with ISAKMP. ISAKMP is using UDP port 500 for both the source and destination port. By using PNAT, you migh have an issue if your NATing device changes the source port number. Look at your translation table on the router (or whoever has access) to see if any port translation has occured.

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