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  • Cisco. "How Virtual Private Networks Work." Oct. 13, 2008. (May 6, 2019) https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/14106-how-vpn-works.html
  • Friedl, Stephen J. "Steve Friedl's Unixwiz.net Tech Tips: An Illustrated Guide to IPSec." Aug. 24, 2005. (May 6, 2019) http://www.unixwiz.net/techtips/iguide-ipsec.html
  • Microsoft. "TechNect: VPN Tunneling Protocols." 2011. (May 6, 2019) http://technet.microsoft.com/en-us/library/cc771298(WS.10).aspx
  • Pandya, Hiten M. "FreeBSD Handbook: Understanding IPSec." The FreeBSD Documentation Project. (May 6, 2019) http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/ipsec.html