setting up a LAT service via a terminal server

From: Phillip Helbig---remove CLOTHES to reply (helbig_at_astro.multiCLOTHESvax.de)
Date: 08/23/03 

Date: Sat, 23 Aug 2003 14:09:45 +0000 (UTC)

Apart from the consoles, I have a VT320 connected to a serial port of a
node in my hobbyist cluster. If that node is down for some reason,
however, then of course one can't log in via that terminal. (The
terminal in question is in my son's bedroom. How many 9-year-olds do
you know who know how to use EDT? One of my biggest triumphs was when I
heard him say "Mama's PC doesn't have a PROPER keyboard"!) Thus, I
would like to have the terminal connect to the CLUSTER instead of to a
specific node.

It seems the way to do this would be to connect via a terminal server.
I have a DECserver 250 and a DECserver 200/MC. Presumably these will
work fine for what I want to do. I also have the necessary cables etc.

Unfortunately, this stuff is located 500 km from where I spend most of
my time, so I don't have much time to experiment. What I need is a
step-by-step guide to setting up what I need. Presumably, the LAT
service has to be created somehow, perhaps the terminal server has to
boot from somewhere etc.

I have no experience with LAT other than using SET HOST/LAT to connect
to other nodes (in the cluster) and no experience with terminal servers
(except as an end-user).

Ideally, switching on the VT and hitting RETURN would bring up the login
sequence from some machine in the cluster.

At the moment, the cluster has a VAX at 7.3, a VAX at 7.2 and an ALPHA
at 7.2-1. There is no DECnet running. LAT is configured so that one
can SET HOST/LAT to and from any machine in the cluster. With TCPIP I
have a cluster alias so that to the outside world, the cluster behaves
as one machine. Ideally, I'd like the same functionality with LAT. (In
fact, since the connection to the outside world is via a DSL
switch/router which does PAT and forwards incoming connections to the
cluster alias, not only is there just one address for INcoming
connections, but just one address for OUTgoing connections as well, the
external address of the router. (Normally, a cluster alias applies to
just incoming connections, whereas each node will use its own address
for outgoing connections.))

Load-balancing would be nice just to get some experience with it, but
for my purposes failover (like with the TCPIP cluster alias) would be
enough.

While I'm at it, I have an LNO3 sitting around. Can I connect that to
the terminal server as well?

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