3Com REMOTE ACCESS SYSTEM 1500, Management Manual

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Step Four: Configure
Additional
Parameters
You can configure several additional network user parameters. Use the
following steps to configure additional parameters:
1 Configure the Maximum Transmission Unit (MTU).
MTU is the largest packet size (in bytes) RAS 1500 accepts. The default
setting is 1514 for PPP and SLIP, although the maximum MTU SLIP accepts
is 1006. PPP connections negotiate the MTU while SLIP connections do
not.
Use the following command:
set network user
<name> mtu <number>
Example:
set network user tom mtu 1006
2 Configure PAP/CHAP authentication.
By default, RAS 1500 is configured globally to use either the Password
Authentication Protocol (PAP), or Challenge-Handshake Authentication
Protocol (CHAP) for PPP connections.
The default setting is either . When a user dials in, RAS 1500 first tries to
authenticate the user using CHAP. If the remote computer does not
respond, RAS 1500 attempts to use PAP. If the remote computer doesn't
respond, the connection is dropped. Change the authentication setting
by typing:
set ppp receive_authentication [chap | pap | either | none]
Example:
set ppp receive_authentication chap
3 Configure callback phone numbers. Callback phone numbers only work
when a user is configured as a callback user.
These phone numbers do not apply to other dial-in users.
set user
<name> phone_number <number>
set user <name> alternate_phone_number <number>
Example:
set user tom phone_number 555-1234
set user tom alternate_phone_number 555-5678