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  • Cisco. "How Virtual Private Networks Work." Oct. 13, 2008. (April 4, 2011)http://www.cisco.com/application/pdf/paws/14106/how_vpn_works.pdf
  • Friedl, Stephen J. "Steve Friedl's Unixwiz.net Tech Tips: An Illustrated Guide to IPSec." Aug. 24, 2005. (April 4, 2011)http://www.unixwiz.net/techtips/iguide-ipsec.html
  • Microsoft. "TechNect: VPN Tunneling Protocols." 2011. (April 3, 2011)http://technet.microsoft.com/en-us/library/cc771298(WS.10).aspx
  • Pandya, Hiten M. "FreeBSD Handbook: Understanding IPSec." The FreeBSD Documentation Project. (April 4, 2011)http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/ipsec.html

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