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This chapter describes the commands used for configuring PPP callback for DDR and ISDN.
For information about the configuration steps used to configure PPP callback, see the "Configure PPP Callback for DDR and ISDN" in the Dial Solutions Configuration Guide.
Many of the dialer commands used in this chapter are described in the DDR part of this manual.
See RFC 1570 for more information about PPP callback.
To enable callback security, use the dialer callback-secure interface configuration command.
dialer callback-secureThis command has no arguments or keywords.
Disabled
Interface configuration
This command ensures that the initial call is always disconnected at the receiving end and that the return call is made only if the username is configured for callback. If the username (hostname in the dialer map command) is not configured for callback, the initial call stays up and no return call is made.
The following partial example configures BRI 0 with the commands required to make it function as the callback server on the shared network. Callback security is enabled on BRI 0.
interface BRI0 ip address 171.1.1.9 255.255.255.0 encapsulation ppp dialer callback-secure dialer enable-timeout 2 dialer map ip 171.1.1.8 name atlanta class dial1 81012345678901 dialer-group 1 ppp callback accept ppp authentication chap ! map-class dialer dial1 dialer callback-server username
You can use the master indexes or search online to find documentation of related commands.
dialer callback-server
dialer map
map-class
ppp callback accept
To enable an interface to make return calls when callback is successfully negotiated, use the dialer callback-server interface configuration command.
dialer callback-server [username dialstring]| username | (Optional) Identifies the return call by looking up the authenticated host name in a dialer map command. This is the default. |
| dialstring | (Optional) Identifies the return call during callback negotiation. |
Disabled. The default keyword is username.
Interface configuration
The following partial example configures BRI 0 to function as the callback server on the shared network.
interface BRI0 ip address 171.1.1.9 255.255.255.0 encapsulation ppp dialer callback-secure dialer enable-timeout 2 dialer map ip 171.1.1.8 name atlanta class dial1 81012345678901 dialer-group 1 ppp callback accept ppp authentication chap ! map-class dialer dial1 dialer callback-server username
You can use the master indexes or search online to find documentation of related commands.
dialer callback-secure
dialer enable-timeout
dialer hold-queue
dialer map
map-class
ppp callback
To define a class of shared configuration parameters for PPP callback, use the map-class dialer global configuration command.
map-class dialer classname| classname | Unique class identifier. |
Disabled; no class name is provided.
Global configuration
The classname in the map-class dialer command used to specify the class for PPP callback must be the same as the classname used in the dialer map command.
This command is used on the PPP callback server, not on the callback client.
The following partial example configures BRI 0 to function as the callback server on the shared network. The callback server requires an enable timeout and a map class to be defined.
interface BRI0 ip address 7.1.1.7 255.255.255.0 encapsulation ppp dialer callback-secure dialer enable-timeout 2 dialer map ip 7.1.1.8 name atlanta class dial1 81012345678901 dialer-group 1 ppp callback accept ppp authentication chap ! map-class dialer dial1 dialer callback-server username
You can use the master indexes or search online to find documentation of related commands.
dialer map
To enable a dialer interface that is not a data terminal ready (DTR) interface to function either as a callback client that requests callback or as a callback server that accepts callback requests, use the ppp callback interface configuration command.
ppp callback {accept | request}| accept | Enables this dialer interface to accept PPP callback requests (and function as the PPP callback server). |
| request | Enables this dialer interface to request PPP callback (and function as the PPP callback client). |
Callback requests are neither accepted nor requested.
Interface configuration
This command first appeared in Cisco IOS Release 11.1.
An interface can request PPP callback only if the interface is configured for PPP authentication with Challenge Handshake Authentication Protocol (CHAP) or Password Authentication Protocol (PAP).
The following example configures a previously defined dialer interface to accept PPP callback requests:
ppp callback accept
You can use the master indexes or search online to find documentation of related commands.
dialer callback-secure
map-class dialer
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