You need to create a group for your local FW that excludes the 172.16.18.50 
from your local encryption domain, if I am reading this correct.

-GS




________________________________
From: Oscar Esquivel <[email protected]>
To: [email protected]
Sent: Thursday, January 29, 2009 5:19:53 PM
Subject: [FW-1] overlapping encryption domain

Hello, I am trying to create a vpn site-to-site with a remote firewall. 
Remote encryption domain is a host 172.16.18.50, which already belong to
a local WAN connection in my firewall, that's why I already have a route
to this node. I know this could be accomplish through NAT.
I`ve created all the configuration, but this is the error message I got
on tacker:
"encryption failure: Different community ID, possible NAT problem (VPN
Error code 01)"

I`ve created the next configuration:

Interoperable devices: 
I`ve created an object for the remote firewall, with a group under
topology for the remote encryption domain, that includes objects:

Object name :Vpn_host
ip 172.16.18.50

Object name :Vpn_host_with_nat
ip 11.16.18.50


Nat rules added manually

Rule #1 for outgoing traffic over vpn
Original Packet
Source: 172.26.2.250
Destination: 11.16.18.50
Service:any

Translated Packet
Source: original
Destination: 172.16.18.50
Service: original


Rule#2 for incoming traffic over pvn
Original Packet
Source: 172.16.8.50
Destination: 172.26.2.250
Service:any

Translated Packet
Source: 11.16.18.50
Destination: original
Service: original

Scanned by Check Point Total Security Gateway.

Scanned by Check Point Total Security Gateway.

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