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To: userservices@ATHENA.MIT.EDU, cappdev@ATHENA.MIT.EDU
Subject: latest on dial-ups
Date: Tue, 19 May 87 16:19:45 EDT
From: Jacqueline A. Stewart <jstewart@ATHENA.MIT.EDU>

cf attached
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To: jstewart@ATHENA.MIT.EDU
Cc: lerman@ATHENA.MIT.EDU, geer@ATHENA.MIT.EDU, treese@ATHENA.MIT.EDU
Subject:  progress on dial-in plan
From: Jerome H. Saltzer <Saltzer@ATHENA.MIT.EDU>
Originating-Client:  <E40-391A-1.MIT.EDU>

(please forward as necessary--I've lost track of who you were
involving in this discussion.)

Jackie,

Dan, Win, Steve, and I just made some progress on a dial-in plan.
The basic ground rule was to find the thing that requires minimum
implementation and engineering effort for September, with a
possibility of upgrade later after we catch our collective breath.
The bottom line is that it looks like we can announce that dial-in
facilities will be available.

The mechanism is to configure a VS-II with up to 8 1200 baud serial
ports, set it up in a room where dial-ins currently occur (e.g.,
next to Zeus), move the lines over to it, and run it as a
"time-sharing workstation".

What that latter label means is that there are no permanent
accounts; workstation login is done using Kerberos, creating a
temporary directory on the fly in /tmp, and attaching the user's NFS
locker, just as on a workstation.

In other words, we run a very slight variation on standard
workstation software, and the user finds the environment essentially
identical to that of a standard VS-2.  The main differences are that
X isn't available, and that up to 7 other users are competing for
the workstation's cycles.

Dan is going to try to set an example up in the basement to see how
well it actually works and what minor tinkering might be needed to
toehold, activate, and deactivate to make it all work right.

Note that a user with a private workstation can rlogin to there 
after logging in on the dial-in machine.

					Jerry

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