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Pix to Pix VPN behind a Checkpoint Firewall

Has anyone had any luck having VPN tunnel betweeen 2 pix firewalls and the one side sits behind a Check Point Firewall? It works fine in parallel with the checkppoint. Wondering about ports/encryption on checkpoint that needs addressing and any debugging commands that mught be helpful.

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New Member

Re: Pix to Pix VPN behind a Checkpoint Firewall

1. The following should be open on the Checkpoint.

Protocol 50 (esp)

Protocol 51 (ahp)

UDP port 500 (isakmp)

2. Pix Ipsec will not work if its peer address is port translated (PAT).

3. debug crypto isakmp sa

debug crypto ipsec sa

both debugs will show you where and why tunnel is failing.

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