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Configuration example for circular dial string backup and
Internet access with DCC
Network requirements
As shown in Figure 56:
• Router A and Router B are connected across a PSTN network.
• Router B operates as an access server and is configured with an IP address of 100.1.1.254/24.
It uses the address range of 100.1.1.1/24 to 100.1.1.16/24 for address assignment. The PSTN
dial strings available on it are 8810048 through 8810055, allowing the router to provide services
to 16 online users.
• Router A accepts the IP address assigned by Router B.
Configure Router A on the dialup side to implement cyclic dial string backup with dialer routes.
Configure Router B on the access side to use asynchronous serial interfaces to provide DCC dialup
access and adopt PAP to authenticate the dialup side.
As shown in Figure 57, Route
r C and Router D are connected across an ISDN network. The
configurations of Router C and Router D are the same as those of Router A and Router B, except
that Router D uses an ISDN dial string 8810048, rather than PSTN dial strings, to provide services.
Configure Router C and Router D to implement DCC with one dial string and use CHAP for
authentication.
Figure 56 Network diagram for dial string backup/access service with DCC (PSTN)
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