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Linux System Administration phần 7

Dòng này khác nhau từ một trong những trình bày trước đó chỉ trong trường hợp không có các tham số r-. Chương trình mgetty được thiết kế để sử dụng với modem (vì thế mà m mgetty),-r thông số để vô hiệu hóa một số chức năng mgetty bình thường. Cụ thể, mgetty thường gửi mã lệnh để modem để chuẩn bị để nhận cuộc gọi, | This line differs from the one presented earlier only in the absence of the -r parameter. The mgetty program was designed for use with modems hence the m in mgetty so the -r parameter disables some normal mgetty functionality. Specifically mgetty normally sends command codes to the modem to prepare it to receive calls and mgetty responds to a modem s connect messages by running the Linux login program on the serial port. Removing the -r parameter from the etc inittab line re-enables the use of modem configuration commands. Administrator s Logbook Accepting Remote Logins System E12345678 Action Configured system to accept remote logins via dev ttyS1 using 57 600bps port speed and mgetty. File modified etc inittab Accepting PPP Connections It s sometimes desirable to configure a Linux system to accept PPP logins. So configured an Internet-enabled Linux computer can function as a gateway between a remote computer running any of several operating systems and the Internet. This setup can be convenient if you have a system at work with always-on Internet access and a modem and you want to provide yourself or your employees with Internet access at home or when you or they are on the road. Many ISPs use Linux systems running PPP servers to handle dozens hundreds or more users. Note 56Kbps modems operate with a speed asymmetry upload speeds are slower than are download speeds. This state of affairs exists because the high upload speeds require that one system the ISP s computer in a normal configuration have a special connection to the telephone network. Unless you acquire such a connection your dial-in PPP system will be limited to 33.6Kbps speeds even if both sides use 56Kbps modems. There are many ways to accept PPP connections. The method described here is comparatively simple to set up but it requires that the calling system use a connection script or manually enter authentication information. No matter how you do it there are several configuration features you must .