Firewall-1

[FW-1] Another VPN and NAT question

Subject: [FW-1] Another VPN and NAT question
From: Sascha Picchiantano <sascha AT PICCHIANTANO DOT DE>
To: FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM
Date: Sun, 15 Apr 2007 17:36:08 +0200
Hi,

closely related to the other question I asked a couple of days ago, I was just thinking about how to configure a site-to-site VPN if the remote peer uses IP addresses that I already use in another VPN. I guess I could just NAT his address range to whatever I like and I can work with, but what I can't figure out is what I would put into the encryption domain of the remote end's gateway object. His original addresses or the NAT addresses I defined?

I figure that if I use the original addressses, it might not work because I already have these addresses in another encryption domain and VPN-1 could not decide which VPN to use...? But if I use the NAT addresses, wouldn't I see tons of "no valid SA" entries in my log because within the VPN tunnel the IP addresses are different than those in the enc domain...?

Confusing. Hope my thoughts make sense to you and you can give me some enlightment :)

Cheers
Sascha

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