From: Roger Wang (rwang@xxxxxxxxxxx)
Date: Wed Jun 14 2000 - 15:59:48 GMT-3
Yeah, I think I got it. The problem lies at reverse telnetting into a tty
line (with an exec running) that's connected to another router's console
(with an exec running). I didn't know where the 2nd exec process came from.
Thanks,
Rog
> -----Original Message-----
> From: DLStewart [mailto:dlstewart@bigfoot.com]
> Sent: Wednesday, June 14, 2000 2:26 PM
> To: rwang@genuity.net; Jeff Sapiro; ccielab@groupstudy.com
> Subject: RE: terminal server question
>
>
> OK. That's a big problem on a lot of topics, we learn what
> works without knowing the underlying concepts.
>
> The "exec" is short for executive. It is a process that runs
> the CLI (command line interface). With an exec, a tty default,
> connecting to the tty (a normal tia-232 async port) with a
> terminal will let the user hit enter and get a response from
> the terminal server. This can be a prompt for a password or
> the CLI prompt, of course.
>
> The problem we are talking about happens when you connect a tty
> line (which has an exec process running) to a console port of
> a router (which has an exec process running).
>
> When you connect an exec to an exec, you can get chatting. This
> happens when one of the execs sends characters (usually with a
> carriage return at the end) to the other. The other exec responds
> with HUH? (with a carriage return at the end). The first exec
> says HUH? back (one HUH? per carriage return it sees). This is
> why there is an indication of "incoming connection" when the port
> is hung. A "cle line" will usually stop it, but may not if the
> other exec isn't finished with the queue full of messages it
> has to respond to.
>
> (I know this is more detail than necessary, but this is a list
> with all levels of users. Please don't feel I am over explaining
> to you just because you asked the question.)
>
> Dave
> - - - - -
> At 09:43 AM 6/14/00, Roger Wang wrote:
> >Dave,
> >
> >Could you explain a little bit more about the "no exec" command
> under tty?
> >I use it myself and it works, but I can't seem to figure out why it's
> >needed.
> >
> >Thanks,
> >
> >Rog
> ...
>
>
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