Chapter 2 Overview of DDFA And Telnet Port Identification

DDFA makes accessing devices attached to DTCs or other terminal servers like accessing MUX devices. DDFA Utilities allow the system administrator to set up a correspondence between these DTC ports and HP-UX device files. With this correspondence defined, the system spooler or a user application can manipulate well-known device files to read and write to specific server ports.

DDFA allows the HP-UX Spooler for printers attached to DTCs or other servers to be configured in SAM. After the correspondence between printers on a DTC and HP-UX device files has been set-up, SAM (System Administration Management tool) can be used to configure the spooler for DTC-connected printers as well as for MUX-connected printers. The only difference is that the pty device file name of the DTC printer must be used instead of a tty name for a MUX printer. In fact, the standard spooler model scripts can be used with server printer(s).

DDFA allows user applications to access devices attached to DTC and other terminal servers using standard HP-UX system calls. After the correspondence between DTC devices and HP-UX device files has been set up, user applications can use the standard HP-UX read, write, open, close, and ioctl calls. These calls access the devices by manipulating their corresponding device files.

Telnet Port Identification lets the system administrator ensure that incoming Telnet connections from specific DTC ports will be assigned to specific, rather than random pty device files.