Farallon Communications 612 - Manual (Page 90)

6-6 Netopia ISDN Modem User’s Guide
■ S register 82 stores the Multilink Endpoint Identifier Class
value. Valid class values are listed in
Appendix A, “Modem
Operation.”
■ S register 83 stores the actual Multilink Endpoint Identifier.
Note: This option is not required in most cases, so these
registers typically do not have to be changed. Your system
administrator or Internet Ser vice Provider will provide you with a
Multilink Endpoint Identifier if it is required.
Using PPP authentication protocols
The Point-to-Point protocol (PPP), when used with Dial-Up
Networking, FreePPP, and other software, allows for authentication
of users dialing into hosts or routers. While the connection between
a user and host is being established, the host may request
authentication before the link is established. In addition, the host
will request a cer tain type of authentication: typically Password
Authentication Protocol (PAP) or Challenge Handshake
Authentication Protocol (CHAP). PAP verifies the user’s plain text ID
and password. CHAP is a stronger authentication method. It uses
encr yption and may repeatedly verify the user’s ID any time during
the connection.
In response to the host’s request, the client software indicates
whether or not it suppor ts the same type of authentication. If it
does not suppor t the same type of authentication, it may request an
alternative type of authentication. (For example, if the host requests
CHAP, but the client software only suppor ts PAP, the client software
will request PAP.) After establishing a type of authentication, the
process of verifying the user begins.
Both PAP and CHAP are built into the Netopia ISDN Modem and are
configured by your PPP software. To enable CHAP using Windows 95
Dial-Up Networking, check the Require encr ypted password box in
the Ser ver Types dialog box.