Bibliografia
• Fergusson P., Huston G., “What is a VPN? - Part I”, The Internet Protocol Journal – Cisco, vol. 1, n°. 1, 1998 - Link
• Fergusson P., Huston G., “What is a VPN? - Part II”, The Internet Protocol Journal – Cisco, vol. 1, n°. 2, 1998 - Link
• Kuo Chin, Liou . “Rede Privada Virtual – VPN” - Link
• Albert Greenberg , Partho Mishra , K. K. Ramakrishnan , Jacobus E. Van Der Merwe , Naganand Doraswamy , Shantigram Jagannath. “A Performance Oriented Service Interface for Virtual Private Networks”, 1998. - Link
• Lima Fernandes Martins, Dêner. “Redes Privadas Virtuais com IPSec”, 2000 - Link