Attention: Do not use the following commands unless you want the device to
perform authentication as described in “Using Local or Remote
Authentication” in
Using and Configuring Features
.
venable pap
venable chap
venable spap
Note: SPAPis only available on interfaces that have IBM DIALs Dial-In circuits
configured.
venable mschap
Configuring PPP Callback
Callback is a PPP feature associated with single user dial-in solutions. It attempts to
accomplish two objectives. These objectives are:
vCallback can be used as a form of security. When used in this way,callback is
generally referred to as required callback. When required callback is negotiated
the user will be dialed back at a predetermined number. Only then will the PPP
link be allowed to come up.
vCallback can also be implemented as a toll-saver feature. When used in this way,
callback is generally referred to as roaming callback. Unlike required callback,
roaming callback is requested by the client. The primary function of roaming
callback is to bill the company maintaining the DIALs Server the toll charges
instead of the user.
Callback is supported only on dial-in dial circuits over V.34or ISDN networks.
Example 1: Required callback enabled
Config>add PPP
Enter user name: [ ]? nocallback
Password:
Enter password again:
Is this a Single-User or a Network? (Single-User, Network): [Single-User]
IP address for user nocallback [0.0.0.0]?
Enter HostName: [ ]?
Give 'nocallback' default time allotted ? (Yes, No): [Yes]
Enable Callback for 'nocallback' ? (Yes, No): [No] yes
Type of Callback (Roaming Callback, Required Callback): [Roaming Callback] Requ
Dialback number for this user [ ]? 555-1234
Will 'nocallback' be able to dial-out ? (Yes, No): [No]
PPP User Name: nocallback
Type: Single User
User IP Address: Interface Default
SubNetMask: 255.255.255.255
Hostname: <undefined>
Time-Alotted: Box Default
Call-Back Type: Required Callback
Phone Number: 543-3186
Dial-Out: Not Enabled
Encryption: Not Enabled
Is information correct? (Yes, No, Quit): [No] yes
Example 2: Callback disabled
Config>add PPP
Enter user name: [ ]? sallydoe
Password:
Enter password again:
Is this a Single-User or a Network? (Single-User, Network): [Single-User]
IP address for user nocallback [0.0.0.0]?
Enter HostName: [ ]?
Give 'no callback' default time allotted ? (Yes, No): [Yes]
Enable Callback for 'no callback' ? (Yes, No): [No]
Will 'no callback' be able to dial-out ? (Yes, No): [No]
Using PPP
Chapter32. Using Point-to-Point Protocol Interfaces 459
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