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# Specify interface Serial 2/0 as the callback client.
[RouterA-Serial2/0] ppp callback client
[RouterA-Serial2/0] dialer timer enable 15
[RouterA-Serial2/0] quit
# Configure the user interface to be used and enable modem dial-in and dial-out on it.
[RouterA] user-interface tty1
[RouterA-ui-tty1] modem both
b. Configure Router B:
# Configure a dial access control rule for dialer access group 2. Create a local user account
usera for Router A, and configure PPP authentication for it.
<RouterB> system-view
[RouterB] dialer-rule 2 ip permit
[RouterB] local-user usera
[RouterB-luser-usera] password simple usera
[RouterB-luser-usera] service-type ppp
[RouterB-luser-usera] quit
# Assign an IP address to interface Serial 2/0 and configure its physical layer and C-DCC
parameters.
[RouterB] interface serial 2/0
[RouterB-Serial2/0] ip address 100.1.1.2 255.255.255.0
[RouterB-Serial2/0] physical-mode async
[RouterB-Serial2/0] async mode protocol
[RouterB-Serial2/0] dialer enable-circular
[RouterB-Serial2/0] dialer-group 2
[RouterB-Serial2/0] link-protocol ppp
[RouterB-Serial2/0] ppp authentication-mode pap
# Specify the local end as the callback server, and set the callback reference to user. DCC
identifies the dial string for callback according to the username configured in the dialer
route command.
[RouterB-Serial2/0] dialer callback-center user
[RouterB-Serial2/0] dialer route ip 100.1.1.1 user usera 8810048
[RouterB-Serial2/0] ppp callback server
[RouterB-Serial2/0] quit
# Configure the user interface to be used and enable modem dial-in and dial-out on it.
[RouterB] user-interface tty2
[RouterB-ui-tty2] modem both
• Method 2: Use C-DCC to implement PPP callback, allowing the callback server to identify the
dial string for callback by comparing the remote username received in PPP authentication
against the local user database for a match.
c. Configure Router A:
# Configure a dial access control rule for dialer access group 1.
<RouterA> system-view
[RouterA] dialer-rule 1 ip permit
# Assign an IP address to interface Serial 2/0 and configure its physical layer and C-DCC
parameters.
[RouterA] interface serial 2/0
[RouterA-Serial2/0] ip address 100.1.1.1 255.255.255.0
[RouterA-Serial2/0] physical-mode async
[RouterA-Serial2/0] async mode protocol
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