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https://github.com/ivanilves/xiringuito
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http://openvpn.net/index.php/open-source/documentation/howto.html
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http://campagnol.sourceforge.net/#hole_punching
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http://gentoo-wiki.com/HOWTO_OpenSwan_2.6_kernel
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http://www.gnome.org/projects/NetworkManager
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http://www.toulouse-sans-fil.net/wiki...penVPN#.2Fetc.2Fopenvpn.2Fserver.conf
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http://www.tinc-vpn.org/security
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http://www.instant-vpn.com/how_it_works.asp
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http://www.linuxjournal.com/article/7949