MP-20x Telephone Adapter 112 Document #: LTRT-50609
User's Manual
10.2.2.1 PPP Authentication
Point-to-Point Protocol (PPP) currently supports four authentication protocols:
1. Password Authentication Protocol (PAP)
2. Challenge Handshake Authentication Protocol (CHAP)
3. Microsoft CHAP version 1
4. Microsoft CHAP version 2
This section allows you to select the authentication protocols your MP-20x may use when
negotiating with a PPTP server. Select all the protocols if no information is available about
the server's authentication protocols. Note that encryption is performed only if 'Microsoft
CHAP', 'Microsoft CHAP version 2', or both are selected.
Table 10-5: PPP Authentication Parameter Descriptions
Parameter Description
Login User Name
As agreed with ISP.
Login Password
As agreed with ISP.
Support
Unencrypted
Password (PAP)
Password Authentication Protocol (PAP) is a simple, plaintext authentication
scheme. The user name and password are requested by your networking peer
in plaintext. 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)
The Challenge Handshake Authentication Protocol (CHAP) is 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
Select this check box if you are communicating with a peer that uses Microsoft
CHAP authentication protocol.
Support Microsoft
CHAP Version 2
Select this check box if you are communicating with a peer that uses Microsoft
CHAP Version 2 authentication protocol.
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