IPSec between OpenBSD 3.9 and Linux with OpenSWAN
IPSec in Linux/Unix distrabutions have made great strides in there IPSec implementations. It is now relativly easy to create an IPSec tunnel between two boxes of the same type. For example, [http://www.securityfocus.com/infocus/1859?ref=rss]. But, interoperbility between platforms still requires the user to whild dark the dark magic of IPSec. OpenBSD has a very nice IPSec implementation.Read more for sample config files for a OpenBSD to Linux tunnel