Isakmpd VPN to OpenBSD docs

[stan]

I've ste up some VPN's between OpneBSD machines using isakmpd, ipsectl, and
gif. Now I'd like to use FreeBSD for one end of some of these. I see that
there is an isakmpd port, and a port called ipsec-tools.

Can anyon pont me to some documetation on how to make this work cross
platform?

-- 
Unix is very simple, but it takes a genius to understand the simplicity.
(Dennis Ritchie)