[CLUE-Tech] Hyperterminal, minicom, and SSH

[Frank Whiteley]

Hyperterminal PE is quite capable of making a TCP/IP (winsock) connection.
I just telneted into my C678 via hyperterminal on a discrete, user-defined
port (IOW, something far removed from 23).

SSH works on a different port (22) and is, by default, keyed secure, which
Hyperterminal does not support.

Frank Whiteley

----- Original Message -----
From: "David Anselmi" <anselmi at americanisp.net>
To: <clue-tech at clue.denver.co.us>
Sent: Sunday, July 13, 2003 19:48
Subject: Re: [CLUE-Tech] Hyperterminal, minicom, and SSH


> Kevin Cullis wrote:
> [...]
> > My wife uses Hyperterminal to access from home a separate phone number
> > but has recently access the same info via the organization's network the
> > MLS system.  Would SSH do the same as Hyperterminal?
>
> Probably not.  To talk to a modem you are, essentially, talking to a
> serial port.  Hyperterminal talks to serial ports.  Minicom talks to
> serial ports.  Telnet and SSH talk TCP (network card, not serial port).
>
> > Why?  My wife says that the "command line" is faster and she's now using
> > Linux to access the web based stuff and I'm trying to get her connected
> > via possibly SSH to further "disconnect" her from Winblows.
> >
> > Any suggestions or hints to follow?
>
> Minicom seems to be exactly what you want.  Is there something about it
> you don't like, or something it does/doesn't do that you want?
>
> <geek stuff><!-- this is kind of long, might want to bail now-->
> Like most things in computing, this stuff is built in layers, so let's
> look at it that way.
>
> You have a phone line that runs from your house to the MLS system.
> Phone lines carry sound -- voice conversations.  Two modems can talk to
> each other using sound over a phone line (they send bits of course, not
> speech).  That's the first layer.
>
> Computers connect to modems through a serial port (either from a
> physical port connected to an external modem, or through a port built
> into the modem card).  We'll ignore Winmodems for now, their differences
> are orthogonal to this discussion.  Naturally the serial port sends bits
> between the computer and the modem.  This is the second layer.
>
> At the next layer you have two choices.  Originally serial ports
> connected to teletypes, the keyboard/monitor used to interact with the
> computer.  So the thing sent back and forth over the serial port was
> ASCII, text and control characters.  That still works today.  On your
> Linux box, your virtual consoles are simulated serial ports.  Your
> pseudo terminals (for xterms or telnet or whatever) are simulated serial
> ports.  And you have some real serial ports.
>
> Take a look at your /etc/inittab and you'll see some lines about
> tty[1-6].  Those are your virtual consoles and a program like getty
> listens to them.  Want to log in to your machine over a modem?  Just
> copy the tty1 line and change tty1 to ttyS0, plug your first serial port
> into a modem, and dial away.  getty is a program that waits for
> connections to a serial port and runs the login program when one occurs.
>   In the network world you use telnet (client) and telnetd (server) to
> do this.  In the serial world it's minicom (or similar) and getty.
>
> The other choice you have is to run a network protocol over your serial
> line.  That is what most people do with their modems these days and the
> program they use (taking the place of minicom) is ppp.  Where minicom
> and getty allow you to run a keyboard/monitor over a modem, ppp allows
> you to run a network connection over it.  Your modem, serial port, and
> ppp take the place of your network card.
>
> So with that lengthy background (if you're still reading), if your wife
> is using hyperterminal she's not using TCP/IP so she can't use telnet or
> ssh.  She can use minicom.  There might also be "command line" versions
> of minicom (which is screen oriented like vi) or you can set up the
> command line and scripts to dial numbers for you and so on.  But minicom
> adds modem setup stuff, dialing directory, and so on, so screen
> orientation makes it a little more friendly.
> </geek stuff>
>
> Dave
>
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