This description only applies to
UnixWare® up to Release 7.1.1.
UnixWare 7 Release 7.2 uses the nddmdid daemon to
replace dlpid as well as performing other functions.
The dlpid daemon is called from the
network driver start/stop script to link an instance of the
common DLPI (Data Link Provider Interface)
module to each MDI (MAC Driver Interface)
driver instance using I_LINK STREAMS
The DLPI module provides common media-dependent
The MDI drivers are specific to network adapter types;
they simply pass STREAMS message blocks between the
DLPI module and the adapter, queuing frames before
transmission if the hardware is busy.
MAC (Media Access Control) frame multiplexing and
LLC Class 1, a common low-level networking protocol
that is used by IPX/SPX, NetBEUI, and OSI. It
is required by SNAP.
SNAP (Sub Network Access Protocol), a low-level
networking protocol that enables Ethernet-oriented stacks (such
as TCP/IP) to run on non-Ethernet networks.
source routing, a low-level networking protocol used by ring
topology networks (such as Token Ring and FDDI) to
enable frames to traverse multiple connected rings.
The dlpid daemon is started in the background by
/etc/nd start and remains active while the system is
in multi user mode. dlpid opens the DLPI
and MDI device files, and keeps them linked and ready
for protocol stack use.
The dlpid pipe is /etc/inst/nd/dlpidPIPE.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004