From owner-freebsd-hackers@freebsd.org  Sun Apr 10 20:25:43 2016
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> dealing with layer 3 so you cant use normal port forwarding  for the tunnel
> traffic. The key exchange is less problematic. It was a bit of a head ache,
> and if you can avoid the NAT you will be far better off.

If i can avoid NAT i would use available FreeBSD IPSEC tunnel guides :)