If you have a limited number of registered IP addresses and you cannot use PAT, you can configure PIX Firewall to use NAT for connections to the public Internet, but avoid NAT for traffic between the two intranets. This configuration might also be useful if you were replacing a direct, leased-line connection between two intranets.
Unfortunately , i never got it to work. I am still working with NAT at the Spokes for now. But i could not make it work in lab , even with non-overlapping subnets. It's more the vrf stuff that i don't understand enough. If you have a working vrf aware IPSEC config without NAT , can you post it ? I could start from there and do NAT tests on my side also.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...