Looks like we receive the IKE packet from the remote end, confirm that the IKE parameters match, but also determine that there is a NAT box in between so we start doing NAT-T, meaning we start sending all packets encapsulated in UDP/4500 packets. From that point on we get no response from the other end.
Either the other end doesn't do NAT-T and drops the connection, or the UDP/4500 packets are filtered out somewhere in between and our packets never get to the other end.
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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...