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Inside Windows® Server 2003 by William Boswell

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PPP Authentication

PPP requires that the user present a set of credentials that are then validated by the remote access server. Security of outside connections is supremely important, so it is worth taking a long look at the details of each authentication method. This information helps you to decide which protocol to use and how to troubleshoot if the protocol gets misconfigured.

PPP itself has no preferred authentication protocol. The authentication method is negotiated during the Link Control Protocol stage of the connection transaction. Windows Server 2003 supports a variety of authentication methods for use within PPP. Here is a short summary of each followed by a detailed analysis:

  • Password Authentication Protocol (PAP). The client transmits ...

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