Mailing List Archive: clogin to reverse telnet on console

clogin to reverse telnet on console

May 14, 2003, 8:06 PM

Post #1 of 3 (1186 views)

Greetings all. I have a cisco 3640 with three NM-32A's acting as a
terminal server for several other routers and switches. One in particular
is my external Internet router. Now I'm trying to add the Internet router
to rancid, but since I can't telnet net to it, I can only access it's
console via reverse telnet to the terminal server, it's been very difficult.

What is happening is when you telnet to the terminal server, you have to
press enter at least once before you get the console login prompt from the
Internet router. So, clogin doesn't get the typical telnet login prompt so
it times out.

Any suggestions on how to get this working?

--ME

clogin to reverse telnet on console [ In reply to ]

heas at shrubbery

May 16, 2003, 10:24 AM

Post #2 of 3 (1161 views)

Permalink

Wed, May 14, 2003 at 09:06:18PM -0700, Mike Ethridge:
> Greetings all. I have a cisco 3640 with three NM-32A's acting as a
> terminal server for several other routers and switches. One in particular
> is my external Internet router. Now I'm trying to add the Internet router
> to rancid, but since I can't telnet net to it, I can only access it's
> console via reverse telnet to the terminal server, it's been very difficult.
>
> What is happening is when you telnet to the terminal server, you have to
> press enter at least once before you get the console login prompt from the
> Internet router. So, clogin doesn't get the typical telnet login prompt so
> it times out.
>
> Any suggestions on how to get this working?
>
> --ME

thought about this for a while. clogin could be changed to permit a
pre-login-sequence command via the .cloginrc, eg: "\r". i can see
this being useful for a few platforms.

but, is it possible to define a chat-script that sends \r when the
async line is opened or connected?

clogin to reverse telnet on console [ In reply to ]

mike at garibaldi0

May 16, 2003, 11:50 AM

Post #3 of 3 (1162 views)

Permalink

At 11:24 AM 5/16/2003 -0700, john heasley wrote:
>Wed, May 14, 2003 at 09:06:18PM -0700, Mike Ethridge:
> > Greetings all. I have a cisco 3640 with three NM-32A's acting as a
> > terminal server for several other routers and switches. One in particular
> > is my external Internet router. Now I'm trying to add the Internet router
> > to rancid, but since I can't telnet net to it, I can only access it's
> > console via reverse telnet to the terminal server, it's been very
> difficult.
> >
> > What is happening is when you telnet to the terminal server, you have to
> > press enter at least once before you get the console login prompt from the
> > Internet router. So, clogin doesn't get the typical telnet login
> prompt so
> > it times out.
> >
> > Any suggestions on how to get this working?
> >
> > --ME
>
>thought about this for a while. clogin could be changed to permit a
>pre-login-sequence command via the .cloginrc, eg: "\r". i can see
>this being useful for a few platforms.
>
>but, is it possible to define a chat-script that sends \r when the
>async line is opened or connected?

John,

You and I are on the same thought path here. I tried all the various
combinations of chat-scripts and they are all designed to work with a
modem or something sending the data to the serial port not from it once a
connection has been received. So, it looks like adding the "\r" will
probably be the answer. However, if there is anyone out there that has
more info on the chat-scripts, they might know of a way to do this. I just
couldn't figure it out.

--ME