Installing and Administering PPP

28 Chapter 2
Setting Up PPP Connections
Creating Device Files for Serial Ports
Creating Device Files for Serial Ports
You need to create device files in the /dev directory for serial ports. Each
serial port used for pppd may require one to four device files. Depending
on the hardware attached, you may need files for dial-in, dial-out, or
direct connection.
Use the System Administration Manager (SAM) to create device files.
Creating the device files with appropriate minor numbers is important.
The following is an example of an entry in /dev for the device tty0b1, a
dial-in modem with hardware flow control enabled.
major number = 1
minor number = 0x000012
The minor number corresponds to the template 0xIIPPHM, which is
resolved as follows:
II Two hexadecimal digits (8 bits) to indicate the instance of
the serial interface. The instance of the serial interface is
determined by running the program ioscan -f and looking in
the “I” column. On a series 700, port A will generally be 0
and port B will generally be 1.