Decnet-tcp/ip gateway.

[Andrew Tridgell]

I installed the decnet internet gateway (comes with the decnet stuff in
Ultrix) and have found it works like a charm. It allows our PC's to
appear as extra displays on our decstation (our PC's have a decnet based
X package - PC DecWindows). We can do the same for vaxes or whatnot.
Basically the gateway makes a decnet node appear like aerodec:N where
you can make N any display number you like.

The source and binaries for this gateway is in 
/usr/examples/decnet/gatethru/ on our system (Ultrix 4.0 on a DS3100).
We added these lines to out /etc files

/etc/inetd.conf:
tba4-X11-display0	stream	tcp	nowait	
/usr/examples/decnet/gatethru/gatewayd gatex -dnet tba4 X$X0

/etc/services:
tba4-X11-display0	6002/tcp		# X11 server on tba4::0.0
/usr/examples/decnet/gatethru/gatewayd


Note that tba4:: is the decnet node name of the real machine (my PC -
but could be any decnet machine running X).  The display becomes
aerodec:2 in this example (from the 6002 entry).  Also note that both of
the entries above are ONE line, I added the carriage returns so it could
be read. 

Performance is quite reasonable, considering the net load.  It means I
can display X clients from SUN's, Sequent's etc.  without installing
Decnet on them, which is a great boon.  It can also be setup to work in
the other direction, but I haven't tried (read the manual for
instructions)

Thanks to DEC for a great product!


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Andrew Tridgell                 CSLab, Research School of Physical Science
tridge at aerodec.anu.edu.au       Australian National University
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