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- Remote Login
-
- Over the internet you can log in to any computer on which
- you have an account or which allows public log ins. This
- includes many database services and almost all library
- catalogs. The means of doing this is called telnet. Tel-
- net is the remote login facility of internet, and once a
- connection is made, works transparently. It's a heady ex-
- perience to log into your account, telnet to Yale to check
- on a book, then to Dartmouth to look up a Shakespeare ref-
- erence, then to U of Michigan for a weather report, then to
- Stanford for a bibliographic search--all from the comfort
- and convenience of home (and at no charge).
-
-
- Magic
-
- Telnet makes your computer seem to be connected to a remote
- computer. What you enter from your keyboard is redirected
- to the remote computer. What the remote computer outputs
- is redirected to your monitor. It doesn't matter how far
- away the other computer is.
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- How To Do It
-
- To telnet to another computer you simply type telnet followed
- by the address of the computer to which you are connecting.
- For example:
-
- telnet newton.dep.anl.gov
-
- You can also use the remote computer's IP address:
-
- telnet 146.139.100.50
-
- which sometimes works when a domain name will not.
-
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- Pay Attention
-
- When you enter telnet with a valid address, you will see
- the message: Trying...
-
- When the connection is made, you will see :
- Connected to newton...
- Escape character is '^]'.
-
- Pay close attention to this escape character message.
- Telnet is telling you which key you can press to get
- out of the current telnet session if things get hope-
- lessly hung up.
-
-
- What If Something Goes Wrong
-
- If telnet is unable to make a connection you may see one
- of the following messages:
- unknown host
- Host is unreachable
-
- Don't be fooled. These messages may be caused by:
- 1) Misspelling the address of the computer
- 2) The remote computer is temporarily down
- 3) The remote computer is really not on the internet
-
- The remedies are to a) try again carefully; b) try again
- later; c) keep trying; d) give up.
-
- User IDs and Passwords
-
- Even though many remote computers are designed for public
- access they still require a log in user ID and password.
- Often, the system will tell you what to type. In other
- cases the user ID and password are published elsewhere and
- you just need to know what they are. Finding out is
- relatively easy over the net.
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- Words Of Warning
-
- When you are finished working on a remote computer, log out
- normally. You will be returned to the telnet prompt
- (telnet>) of your local host computer. To exit the telnet
- program altogether type quit (or q) from the telnet prompt.
-
- Two words of warning:
- 1) Response times from remote computers may be slow,
- especially during peak internet traffic hours. Be
- patient.
- 2) If things become hopelessly hung up when you are
- halfway around the world, use the escape character
- that you conscientiously wrote down when you started.
-
- Telnet Tricks 1
-
- Before we start a sample telnet session, here are a couple
- of useful telnet tricks.
- 1) An alternate way to start a telnet session is to
- type telnet and then press Enter. Then type open
- with the address of the computer to which you want
- to connect. In this way you can keep telnet going
- while you open and close different connections.
-
- 2) Pressing z at the telnet prompt will suspend telnet
- and allow you to work in unix. To exit unix and
- return to telnet type fg. This does not work in
- all unix shells.
-
- Telnet Tricks 2
-
- When you telnet to certain computers, a port number is
- required to connect to the service you want. For example,
- to connect to the weather underground at the University
- of Michigan you must enter the following command:
-
- telnet downwind.sprl.umich.edu 3000
-
- Note the space before the port address 3000. You will find
- several common services that require a port address.
-
- Press PgDn to login and start a sample telnet session...
-
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- Get It?
-
- It's always sunny in San Diego.
-
- That's how telnet works. Press PgDn to continue...
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