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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/OpenBSD/xmPS9tek">OpenBSD</a></li> <li><a href="/facts/PF_(firewall)/pc1fgj4Y">PF (firewall)</a></li> <li><a href="/facts/Common_Address_Redundancy_Protocol/uEItkS3L">CARP</a></li> <li><a href="/facts/Linux-HA/Gk2o3WgD">Linux-HA</a></li> <li><a href="/facts/Linux_Virtual_Server/qz9cHbtj">Linux Virtual Server</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.openbsd.org/faq/pf/carp.html#pfsyncintro">PF: Firewall Redundancy with CARP and pfsync <i>(OpenBSD PF FAQ)</i></a></li> <li><a href="http://mdoc.su/o,f,n/pfsync.4">pfsync(4) man-page in OpenBSD, FreeBSD and NetBSD</a></li> <li><a href="http://bxr.su/OpenBSD/sys/net/if_pfsync.h">sys/net/if_pfsync.h in OpenBSD</a></li> <li><a href="http://bxr.su/OpenBSD/sys/net/if_pfsync.c">sys/net/if_pfsync.c in OpenBSD</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"/etc/protocols". BSD Cross Reference. OpenBSD. pfsync 240 <a href="http://bxr.su/o/etc/protocols" target="_blank">http://bxr.su/o/etc/protocols</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"/sys/net/if_pfsync.h". BSD Cross Reference. OpenBSD. <a href="http://bxr.su/o/sys/net/if_pfsync.h" target="_blank">http://bxr.su/o/sys/net/if_pfsync.h</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Federico Biancuzzi (2004-04-15). "OpenBSD PF Developer Interview". ONLamp. O'Reilly Media. Archived from the original on 2004-05-08. Retrieved 2019-03-20. <a href="https://web.archive.org/web/20040508140530/http://www.onlamp.com/lpt/a/4767" target="_blank">https://web.archive.org/web/20040508140530/http://www.onlamp.com/lpt/a/4767</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Federico Biancuzzi (2004-05-06). "OpenBSD PF Developer Interview, Part 2". ONLamp. O'Reilly Media. Archived from the original on 2004-06-19. Retrieved 2019-03-20. <a href="https://web.archive.org/web/20040619005622/http://www.onlamp.com/lpt/a/4839" target="_blank">https://web.archive.org/web/20040619005622/http://www.onlamp.com/lpt/a/4839</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>