You don't need any NAT if you can route your traffic. Just make sure that the outside router has a route to the private IP of the inside router and the inside router has a route to the public IP of the outside router. Then allow GRE in the ACLs of the ASA for these IPs.
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
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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...