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738 CHAPTER 51: CONFIGURING DCC
callback servers. RouterA and RouterC use the same address 100.1.1.1, whereas
RouterB and RouterD use the same address 100.1.1.2.
Figure 236 Network for the DCC application providing router-to-router callback
Solution 1:
Use Circular DCC to implement PPP callback. The server determines whether to
originate a return call to a client according to the user names configured in the
dialer routes.
1 Configure RouterA:
[Router] dialer-rule 1 ip permit
[Router] interface serial 0
[Router-Serial0] ip address 100.1.1.1 255.255.255.0
[Router-Serial0] physical-mode async
[Router-Serial0] modem
[Router-Serial0] dialer enable-circular
[Router-Serial0] dialer-group 1
[Router-Serial0] dialer route ip 100.1.1.2 8810052
[Router-Serial0] link-protocol ppp
[Router-Serial0] ppp pap local-user usera password simple usera
[Router-Serial0] ppp callback client
2 Configure RouterB:
[Router] dialer-rule 2 ip permit
[Router] local-user usera password simple usera
[Router] interface serial 1
[Router-Serial1] ip address 100.1.1.2 255.255.255.0
[Router-Serial1] physical-mode async
[Router-Serial1] modem
[Router-Serial1] dialer enable-circular
[Router-Serial1] dialer-group 2
[Router-Serial1] dialer route ip 100.1.1.1 user usera 8810048
[Router-Serial1] dialer callback-center user
[Router-Serial1] link-protocol ppp
[Router-Serial1] ppp authentication-mode pap
[Router-Serial1] ppp callback server
Solution 2:
Use Circular DCC to implement PPP callback. The server dynamically creates dialer
routes and originates return calls to the clients according to the dialer numbers.
1 Configure RouterA:
[Router] dialer-rule 1 ip permit
[Router] interface serial 0
Router B
Modem
ISDN
Modem
PSTN
Networking for ISDN caller ID callback
Networking for PPP callback
8810148
8810152
8810048
8810052
Router A
Router C
Router D
Callback Client
Callback Server
Serial0 Serial1
Bri0
Bri1
Callback Client
Callback Server
NT1
NT1