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By International Business Machines Corporation

ISBN-10: 0738414956

ISBN-13: 9780738414959

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Through VPN technology, each branch can also extend the reach of its existing intranet to incorporate the other branch intranets, building an extended, enterprise-wide corporate network. And, as in the business partner/supplier network scenario, this company can easily expand this newly created environment to include its business partners, suppliers, and remote users, through the use of open IPSec technology. 2 Business Partner/Supplier Network Industry-leading companies will be those that can communicate inexpensively and securely to their business partners, subsidiaries, and vendors.

1 Network Address Translation Sometimes globally unique IP addresses are a scarce resource. For example, in Europe, it is especially hard to obtain a globally unique IPv4 address. Other times, a company simply wishes to keep secret the IP addresses of the machines in its intranet (an unlisted address, similar in concept to an unlisted phone number). Both of these situations can be addressed with a function called Network Address Translation (NAT). Network Address Translation (NAT) is usually implemented in a machine that resides at the boundary of a company′s intranet, at the point where there is a link to the public Internet.

Replay protection assures that an attacker can not intercept a datagram and play it back at some later time without being detected. • Automated management of cryptographic keys and security associations assures that a company′s VPN policy can be conveniently and accurately implemented throughout the extended network with little or no manual configuration. These functions make it possible for a VPN′s size to be scaled to whatever size a business requires. Note: The above mentioned areas (among others) are the subject of the discipline of cryptography.

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A comprehensive guide to virtual private networks. Volume I by International Business Machines Corporation

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