bshantz@spry.com says:

For the sake of a friend, I'm trying to explain the basics of IPSP. And I've choked!!! Could someone please explain it. What is it, how does it work. ETC.

Simplified, the idea is that you put a cryptographic encapsulation around your packets and then send them inside other IP packets; the receiver unwraps them and unencrypts them. I'll send sections of my draft if anyone wants to hear more on the topic. Perry