Chapter 13. Site-to-Site IPsec Virtual Private Networking: DMVPN and GET VPN Test Plans
Site-to-site Virtual Private Networks (VPN) provide a flexible and economical method to extend network resources to branch offices, home offices, and business partner sites. In a traditional solution, each branch (“spoke”) and corporate (“hub”) site would be connected to the Internet with a dedicated circuit. This circuit could be an Ethernet, T-carrier, or a less expensive business-level broadband connection such as DSL or cable. A tunneling protocol such as GRE, L2TP, or IPsec would then be used to create a “virtual circuit” between each spoke and the hub location, over which data would be sent in either clear (GRE) or encrypted (L2TP or IPsec) format.
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