http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/www/faq/faq13.html?rev=1.79&content-type=text/html
Keep in mind it was removed for a reason (I used it successfully though). Bruce Marriner wrote:
I am trying to setup an OpenBSD <> OpenBSD VPN Tunnel to connect two remote offices together. I looked around on Google for a how-to or some documentation. It seems the OpenBSD documentation is blank (due to no support). And all the how-to's on the Internet seem to reference very old versions of OpenBSD and none of them that I tried seem to work. If someone knows of an up to date how to or some good documentation on how to get thisworking I would really appreciate it.I want to set up the VPN using manual keying, as from what I have read it is easier to configure and seems to be just fine for my application.

