1. Learn to tame OpenBSD quickly

# file: /etc/pf.conf
# Protect a laptop (allow only ping/ssh from anywhere)
set skip on lo
set fingerprints "/dev/null"
block log all
pass in on egress inet proto icmp all icmp-type echoreq
pass in on egress inet proto tcp from any to any port ssh
pass out

2. History

Forked from NetBSD. Theo de Raadt is the founder and leader of the OpenBSD project. The first OpenBSD release 1.1/CVS appear on October 18, 1995.

3. Why use OpenBSD

4. OpenBSD innovations

Software and ideas developed or maintained by the OpenBSD project: http://www.openbsd.org/innovations.html

5. Thanks!