MP-202 Telephone Adapter
84
LTRT-50604
MP-202
This section allows you to select the authentication protocols your gateway 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.
Figure
9-10: PPP Authentication Settings
Table
9-5: 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.
9.2.4 PPP
Encryption
PPP supports encryption facilities to secure the data across the network connection. A
wide variety of encryption methods may be negotiated, although typically only one method
is used in each direction of the link.