Tunneling
Tunneling is a method of packaging packets so that they can traverse a network in a secure, confidential manner. Tunneling involves encapsulating packets within packets, enabling dissimilar protocols to coexist in a single communication stream, as in IP traffic routed over an Asynchronous Transfer Mode (ATM) network. Tunneling also can provide significant measures of security and confidentiality through encryption and encapsulation methods. The best example of this is a VPN that is established over a public network through the use of a tunnel, as shown in Figure 8-6, connecting a firm’s Boston office to its New York City (NYC) office.
Assume, for example, that a company has multiple locations and decides to use the public Internet to ...
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