This is most commonly used to exempt traffic from nat for use on remote access and lan to lan vpn tunnels. Or any scenario when you want traffic not to be natted. For instance communication between inside and dmz interfaces.
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...