Dial-up Connections
Another relatively recent development in networking that presents a challenge to DNS is the dial-up Internet connection. When the Internet was young and DNS was born, there was no such thing as a dial-up connection. With the enormous explosion in the Internet’s popularity and the propagation of Internet service providers who offer dial-up Internet connectivity to the masses, a whole new breed of problems with name service has been introduced.
We’ll separate dial-up connections into two categories: simple dial-up, by which we mean a single computer that connects to the Internet occasionally, when a user manually initiates a connection; and dial-on-demand, which means one or more computers that connect to the Internet automatically whenever they generate traffic bound for the Internet. Often, the device that makes this dial-on-demand connectivity possible is a small dial-up router with an analog modem or ISDN interface.
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