Setting Up a Dial-In PPP Server
You can also set up a simple service on your Linux system to provide PPP for dial-in users. Although commercial ventures such as ISPs must necessarily invest in leased lines, switching service, modem pools, and routers, you can easily configure a standalone Linux box to answer a modem and start PPP. The general steps may include
Selecting a phone line, modem, and serial port
Properly configuring the modem to answer incoming calls (using AT commands and saving the modem profile with AT&W)
Installing a line-monitoring application (such as agetty, getty, or mgetty) to watch a serial port (in /etc/inittab)
Possibly configuring a DNS server (see Chapter 14, "Domain Name Service and Dynamic Host Configuration Protocol," ...
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