From: crl (cisco@xxxxxxxxxxxx)
Date: Fri May 11 2001 - 11:46:43 GMT-3
When I configure my termserver to allow reverse telnet to async lines 1-16,
I typically set up a host list like:
ip host r1 2001 1.1.1.1
ip host r2 2002 1.1.1.1
The TCP port 2001 is 2000 + <line #> so, line 15 would be port 2015. Since
it sounds like you have a port on the Internet that has an IP on the term
server, you can telnet to the external IP on port 2015 to get line 15.
There must be a better link somewhere, but here's a start:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/dial_
c/dcrtelnt.htm
It is also covered in the BCRAN material, somewhere.
Hope this makes things clearer.
----- Original Message -----
From: "Henson, Charles" <CHenson@neteffectcorp.com>
To: "crl" <cisco@crl.fdns.net>; "Rodney Cain" <rodney@mousetails.net>;
"Groupstudy" <ccielab@groupstudy.com>
Sent: Friday, May 11, 2001 10:35 AM
Subject: RE: Is it possible to change vty tcp (telnet) port to something
other than 23?
> W/O sounding stupid can you elaborate on that please?
>
> Charles
>
>
> -----Original Message-----
> From: crl [mailto:cisco@crl.fdns.net]
> Sent: Friday, May 11, 2001 10:13 AM
> To: Rodney Cain; Groupstudy
> Subject: Re: Is it possible to change vty tcp (telnet) port to something
> other than 23?
>
>
> Since it's the terminal server you're connecting to, you can telnet
directly
> to the devices on the async port (ie. ports 2001-2016). It still won't let
> you into the termserver itself, but this might suffice for what you
need...
>
>
> ----- Original Message -----
> From: "Rodney Cain" <rodney@mousetails.net>
> To: <ccielab@groupstudy.com>
> Sent: Friday, May 11, 2001 8:38 AM
> Subject: Is it possible to change vty tcp (telnet) port to something other
> than 23?
>
>
> > Is it possible to change the port a router listens on for vty telnet
type
> > connections to something other than 23..... say like maybe 999 for
> example?
> >
> > My ISP is blocking inbound telnet connections (tcp port 23), which
> prevents me
> > from connecting directly to my 2511 which is acting as a terminal
server.
> I
> > realize that I could do a port redirect from a small firewall, linux
box,
> etc.
> > but I was hoping there was a secret IOS setting which would accomplish
the
> > same thing. I suppose that if the answer is that it is not possible,
then
> I
> > will have to investigate other options, like ssh. I have had no luck
> > searching for an answer on CCO and elsewhere....
> >
> > Thanks for any help.
> >
> > Rodney Cain
> > rodney@mousetails.net
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