Virtual Ethernet Tunneling

This paper discusses the implementation of virtual Ethernet tunnels using
OpenBSD. The current release of OpenBSD at the time of writing (2001) was
version 2.9, so some of the material may be fairly dated. I haven't revisited
the details since then.

Overview

Without going too deep into the technical details, a virtual Ethernet tunneluses packet encapsulation, Ethernet bridging, and IPSec encryption totunnel a subnet from one host to another host over a public network(generally, the...