PPP Callback Server Configuration Callback Server calls client back

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Rl(config)# username R4 password secret Rl(config)# interface briO/O

Rl(config-if)# ip address 172.16.14.2 255.255.255.252 Rl(config-if)# encapsulation ppp

Rl(config-if)# dialer map ip 172.16.14.1 name R4 class DIALBACK broadcast 3442929

Rl(config-if)# exit

Rl(config)# map-class dialer DIALBACK Rl(config-map-class)# dialer callback-server use

Central Office

Remote Office

© 2001, Cisco Systems, Inc. All rights reserved.

Cisco CCIE Prep v1.O—Module 3-51

Central Office

Remote Office

© 2001, Cisco Systems, Inc. All rights reserved.

Cisco CCIE Prep v1.O—Module 3-51

Server configuration is a little more complex. First, configure the server to accept callback requests with the ppp callback accept command.

The command dialer callback-secure is to perform a couple of key security functions.

■ Disconnect calls that are not properly configured for callback

■ Disconnect any unauthenticated dial-in users

It is not a required component for callback to succeed, but is highly recommended in all callback configurations.

To enable an interface to make return calls when callback is successfully negotiated, issue the dialer callback-server command via a map class. A map class is used to define a template of configuration parameters for PPP callback. The keyword username identifies the return call by looking up the authenticated host name in the dialer map command. In this case, it would be R4.

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