Setting up a network bridge in OpenBSD

Network bridge.
When I started reading about computers and networks, the bridge were something I could not see any good use of. Besides extend a cat 5 cable over 100meters or connect different media.

Nowadays I really know some more benefits by using a (filtering) bridge.

OpenBSD- secure and occupy!
URL
http://www.openbsd.org/faq/faq6.html#Bridge