http://www.openbsdfoundation.org/Edmonton,

http://www.openbsd.org/papers/.

http://www.freebsd.org/doc/en/articles/explaining-bsd/

http://www.benzedrine.cx/pf-paper.html.7.

http://force.coresecurity.com

http://www.pfsense.org

http://www.freebsd.org

http://www.ranum.com/security/computer_security/editorials/dumb/index.html

http://www.kame.net/,

http://marc.info

http://www.ietf.org

http://.faqs.org/,

http://www.kjhole.com

http://www.nowires.org/.MAC

http://www.openbsd.org

http://example.com

http://www.example.com

http://www.openbsd.org/faq/pf/rdr.html#re

http://www.netbsd.org/Documentation/network/pf.html.The

http://bsdly.blogspot.com/2013/10/the-hail-mary-cloud-and-lessons-learned.html.

http://spamassassin.apache.org

http://www.openbsd.org/spamd/traplist.gzFollowing

http://daemon.info

http://www.greylisting.org/.

http://bsdly.blogspot.com/2008/10/ietf-failed-to-account-for-greylisting.html.

http://datadok.no

http://summer-bargainz.com

http://dataped.no

http://branch15.summer-bargainz.com

http://bargainz.com

http://ehtrib.org

http://mainoffice-gw.example.com

http://minorbranch-gw.example.com

http://www.openspf.org

http://marc.info/,

http://www.openbsd.org/spamd/traplist.gz.

http://heise.de

http://www.heise.de/ix/nixspam/dnsbl_en/.Once

http://bsdly.blogspot.com

http://www.benzedrine.cx/ackpri.html.

http://www.netbsd.org/Documentation/network/pf.html

http://setup.total

http://.example.com

http://local2.info

http://loghost.example.com

http://bsdly.net/pfstat-states.jpg

http://www.benzedrine.cx/pfstat.html

http://benzedrine.cx

http://code.google.com

http://nfdump.sourceforge.net/.

http://www.splintered.net/sw/

http://nfsen.sourceforge.net/.

http://www.mindrot.org

http://www.mindrot.org/projects/pf

http://www.packetmischief.ca/openbsd/snmp/.

http://bsdly.blogspot.com/2012/12/ddos-bots-are-people-or-manned-by

http://www.cisco.com/en/US/products/products_security_advisory09186a008011e78d.shtml.

http://undeadly.org

http://www.openbsd.org/,

http://www.openbsd.org/faq/index

http://quigon.bsws.de/papers/2009/eurobsdcon-faster_packets/

http://www.openbsd.org/faq/pf/index.html

http://www.ualberta.ca

http://www.benzedrine.cx/pf.html

http://www.benzedrine.cx/pf-paper.html

http://undeadly.org/cgi?action=article&sid=20060927091645

http://undeadly.org/cgi?action=article&sid=20060929080943

http://www.ietf.org/rfc/rfc1631.txt,

http://www.ietf.org/rfc/rfc3022.txt,

http://www.ietf.org/rfc/rfc1918.txt,

http://www.tcpipguide.com/,

http://www.stonehenge.com/merlyn/UnixReview/col51.html

http://Unix.se

http://unix.se

http://www.probsd.net/pf/

http://www.kernel-panic.it/openbsd.html

http://www.usenix.org/publications/library/proceedings/usenix99/cho.html

http://planet.admon.org/howto/

http://openbsd.org/papers/opencon06-docs/index.html

http://pf4freebsd.love2party.net

http://www.netbsd.org/docs/network/pf.html,

http://www.nowires.org

http://it.Greylisting.org

http://www.greylisting.org

http://greylisting.org/articles/whitepaper.shtml

http://.ualberta.ca/~beck/nycbug06/spamd/

http://bgp-spamd.net

http://www.nostarch.com/pf3/

http://www.bsdly.net/bookofpf/.

http://bsdly.blogspot.com/,

http://home.nuug.no

http://OpenBSD.org

http://www.openbsd.org/orders.html

http://www.openbsd.org/donations.html

http://www.openbsdfoundation.org

http://www.openbsd.org/papers/opencon06-docs/index.html.

http://www.openbsd.org/want.html

http://www.openbsdfoundation.org/.

http://nostarch.com/pf3/