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S register 82 stores the Multilink Endpoint Identifier Class 
value. Valid class values are listed in 

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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.

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.