Hi, > I think the reason why it doesn't work is the following error
Correct. > According to the > bugtracker there is a feature missing in the linux kernel That is a possible reason, yes. But it's not in this case. The problem is this: > Thu, 2018-11-22 18:04 02[IKE] <2> faking NAT situation to enforce UDP > encapsulation The Linux kernel does not support UDP encapsulation for IPv6. So you can't set forceencaps=yes. Regards, Tobias