Slow oncall weekend so hacked up a vpnc+FreeBSD doc. Need to try the OpenSSH+tap and OpenSSH+ControlMaster stuff next. Maybe the “Master” mode can help speed up ssh session setup/tear down which would be nice.
http://shankerbalan.net/wiki/FreeBSD_VPN
UPDATE: http://shankerbalan.net/wiki/FreeBSD_VPN#Split_Routing