User's Manual

FiOS Router User Manual
93
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PPP Authentication
Point-to-Point Protocol (PPP) currently supports four authentication
protocols: Password Authentication Protocol (PAP), Challenge Handshake
Authentication Protocol (CHAP), and Microsoft CHAP versions 1 and 2. Select
the authentication protocols the FiOS Router may use when negotiating with a
PPTP server in this section. Select all the protocols if no information is available
about the server’s authentication methods. Note that encryption is performed
only if Microsoft CHAP, Microsoft CHAP version 2, or both are selected.
Warning: The PPP Authentication settings should not be changed unless
instructed to do so by your ISP.
Login User Name Enter the user name (provided by the ISP) in this text box.
Login Password Enter the password (provided by the ISP) in this text box.
Support Unencrypted Password (PAP) Password Authentication Protocol
(PAP) is a simple, plain-text authentication scheme. The user name and
password are requested by the networking peer in plain-text. PAP, however,
is not a secure authentication protocol. Man-in-the-middle attacks can easily
determine the remote access client’s password. PAP offers no protection against
replay attacks, remote client impersonation, or remote server impersonation.
Support Challenge Handshake Authentication (CHAP) Click in this check
box to activate CHAP, a challenge-response authentication protocol that uses
MD5 to hash the response to a challenge. CHAP protects against replay attacks
by using an arbitrary challenge string per authentication attempt.
Support Microsoft CHAP Click in this check box if communicating with a peer
that uses Microsoft CHAP authentication protocol.
Support Microsoft CHAP Version 2 Select this check box if communicating
with a peer that uses Microsoft CHAP Version 2 authentication protocol.