3Com 3032 Configuration Manual page 742

738 C 51: C
HAPTER ONFIGURING
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
Serial0
Router A
Callback Client
Bri0
Router C
Callback Client
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
8810048 8810052
PSTN
Modem
Networking for PPP callback
8810148
ISDN
NT1
Networking for ISDN caller ID callback
Serial1
Modem
Callback Server
Bri1
8810152
NT1
Router D
Callback Server
Router B