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http://people.freebsd.org/~yar/rcng/article.html
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http://www.public.iastate.edu/~kula/talks/afs-bpw-2005
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http://www.muine.org/~hoang/netnat.html
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http://www.flickr.com/photos/laughingsquid/sets/738459
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http://www.daemonnews.org/200007/newbus-intro.html
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http://www.feyrer.de/NetBSD/blog.html#20050517_0117
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http://www.bgnett.no/~peter/pf
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http://www.hackinthebox.org/article.php?sid=15607
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http://www.taosecurity.com/keeping_freebsd_up-to-date.html
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http://www.inner-smile.com/bsd.phtml