And in addition to Julios advice (9.x is a great release also in my opinion): You should be aware that you have to upgrade in a couple of small steps so that the config can be migrated. I would first upgrade to the latest 8.0 release and then to the latest 8.2. That should go really smooth. The next upgrade to 8.4 will need many manual corrections for the NAT-migration as the automatic migration has never worked well for my ASAs and I have never heard that anyone was happy with the result of the automatic migration. After that, the last step to the latest v9 will again run quite smooth.
But as usual, read the release-notes to be aware of problems that are specific to your environment.
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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...