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12. Dial-on-Demand Routing

Chapter 12. Dial-on-Demand Routing

Dial-on-demand routing (DDR) is useful in applications that don’t require a permanent connection between two sites. This is often the case for small offices or home users who can’t justify the expense of a permanent connection. Instead, communication is through some sort of dial-up terminal server using standard telephone service (either analog or ISDN). The router places a call when it has traffic to send and establishes an IP connection using PPP. When the connection is idle, the router should hang up automatically.[*]

DDR is also useful for backup links; a router can establish a dial-up connection if a permanent, leased-line connection fails. It’s also useful if you need to make connections to many sites through a limited number of modems or asynchronous ports.


  

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