Telnet Port Identification is made possible by a
set of enhancements to the Telnet daemon (telnetd)
, which is part of Internet Services.
In earlier versions of Telnet, incoming connections, including those
coming from a DTC server, were always assigned pty device files
on a random basis.
Internet Services Telnet allows the system administrator to
set up pre-defined pty names defined in the DDFA dedicated port
file, dp. In addition, the DTC download code
was enhanced so that it will deliver board and port information
to the host (via Telnet) at connection establishment time. The host
will map the incoming connection to its pre-defined pty device file,
thereby providing a "dedicated port" by which the identity of the caller can
be determined. The Telnet Port Identification feature is available
with HP-UX and DTCs, but may not be compatible on other servers.
