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AN INSIDER'S GUIDE TO SUN!!1
6. An Insider's GU,ide to SUNet
This chapter describes the current state of network communication around here. Ethernet is used to
connect computers within the same building, with repeaters and gateways being used to temporarily extend
the Ethernet between buildings. Arpanet connects several machines. and some arc connected to Telenet,
Tymnet. and other ad-hoc networks. Eventually we hope to provide other communications media for the
intermediate distance needs, like 10 Mb standard Ethernet, Fiber-optics, point to point serial links. packet
radio, or a broad-band cable. TV compatible system. The rough topology of the network is illustrated in
Figure 6-1. For more information see the references [7] and [16].
This information is really q~ite volatile, so it is imperative that this chapter be kept up to date. Each
description below consists of the computer you want to come from, followed by a colon, and the command
I
that invokes the given program. A short description includes the hosts you can go to with that progranl.
6.1. Remote
Ter~inal
Programs
YAY: telnet
host
Pup user telnet [5] to any Pup host with a telnet server running. Currently this means
Shasta, Diablo, Helens, Lassen, DSN, and Sail. When the gateway is working you can get
to Sumex and "Tiny," the 2020 at the Medical Center. Documentation is obtained with the
man tel net command. Tel net has transcript and shell escape options. Type code 036
followed by c to get out (usually control-t or control-shift-N). Pup telnet has gateway
capabilities to the Arpanet. If the host name you give is not in the PUP network dircctorYt
or there is no PUP route known to it, it will connect to the telnet gateway at Sail and try lhe
Arpanet
Sail: r chat
Pup usertetne~ as above. Control-meta-q to get out. Currently it simulates a very sitnplc
.terminal, so you can°t even do things like backspace.
Alto: te 1 net host
Pup user telnct also, based on the chat program. Simulates a simple screen
which "i almost works. Also available as a boot file.
tenninal~
on
Alto: ta 1k host The ta 1k program gives you multiple windows (stacked vertically), and you can nm
emacs or vi in them. so it is currently the default for Unix telnet servers. You can create a
window of 521ines. and then specify te rm b i gta 1 k to Unix to get a big screen.
Alto: dmchat host
Another terminal program using Pup telnet protocol. based on the Chat program. This one
gives you one big "datamedia" window, which works well with Sail. If you arc using
dmchat. tell Unix you are a dm2599. You must have the fixed width font snai 110. a1
on your disk for this to work (or an entry on your user. em).
Sail: d; a 1 d i ab 10
11 DECEMBER 1981