IPSec site-to-site VPN using OpenBSD 4.3+

I found this nice article on security focus covering step by step instructions for creating a site to site IPSec tunnel.

http://www.securityfocus.com/infocus/1859

Using this as a reference I've been setting up LAN-to-LAN IPSec VPNs for work. Works great with Cisco VPN Concentrators and Nokia IPSO as well.