18.2. Configuring a PPP Server
Before you can set a system up to allow clients to connect with PPP, it must either have a modem attached to a serial port, or be connected via a null-modem cable to another machine. Internal modems that emulate a serial port can be used as well, although they are not recommended as they do not have easily visible LEDs to indicate if the modem is connected, transmitting, and so on. USB modems should work, as long as they are recognized by the kernel—however, they will probably use a special device file. Modems that require special drivers to operate (commonly known as Winmodems) cannot be used at all, unless there is a driver for the modem available for Linux.
Naturally, any modem must be connected to a phone line. ...
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