Bibliografia
[1] What is a VPN? Revision 1 – Paul Ferguson, Cisco Systems and Geoff Huston, Telstra – Abril/1998
[2] Redes Privadas Virtuais com IPSec – Dêner Martins – Agosto/2000
[3] VPN – Virtual Private Network – Ivana Cardial de Miranda - 2002
[4] Redes Virtuais Privadas – Pedro Celestino – 2005
[5] IPSec – Edgard Jamhour – 2009
[6] Rede Privada Virtual – VPN - Liou Kuo Chin - Rede Nacional de Ensino e Pesquisa (RNP) - 1998
[7] How VPN works - Cisco
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