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Windows Server® 2008 TCP/IP Protocols and Services by Joseph Davies

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Authenticated Internet Protocol (AuthIP)

In addition to IKE, Windows Server 2008 and Windows Vista support Authenticated Internet Protocol (AuthIP), an enhanced version of IKE. AuthIP supports additional authentication flexibility with support for user-level authentication, authentication with multiple credentials, improved authentication method negotiation, and asymmetric authentication.

Like IKE, AuthIP supports Main mode and Quick mode negotiation. AuthIP also supports Extended mode, a part of IPsec peer negotiation during which a second round of authentication can be performed. Extended mode, which is optional, can be used for multiple authentications. For example, with Extended mode, you can perform separate computer-level and user-level authentications. ...

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