Yeah, if the telnet client is instructed to use non-standard port
it would not initiate the option negotiation, because it does not
know whether the server it is talking to is a TELNET server or not
(meaning it will behave like TCP client, in otherwords it does not send
any TELNET command or TELNET options to the server). However if the
server (that listen on the non standard port) initiate the option
negotiation then the client gets involved in the negotiation.
BTW, you can configure the TELNET server to use non-standard port,
pls. refer the manual for more detail.
The packet analyser like ethereal decodes only port 23 data as TELNET
data so one has to force the analyser to decode it as the data as TELNET
data... You can do this in ethereal by "Tools::Decode as ... " menu..
But I want to do the same thing like ("Tools::Decode as ... ") in some
non-gui passed tool (preferably tethereal).
Thanks
Jeeva.
> -----Original Message-----
> From: Richard Urwin [mailto:RUrwin@xxxxxxxxxxxxxxx]
> Sent: Thursday, November 15, 2001 4:30 AM
> To: 'Jeeva Chelladhurai'; ethereal-users@xxxxxxxxxxxx
> Subject: RE: [Ethereal-users] Decode as on Tethereal
>
>
> I'm sure you know what you're doing, but this just might be of interest...
> The standard implementation of the TELNET client only uses TELNET protocol
> to port 23. When instructed to use another port it uses raw TCP.
>
> Over to someone else for an actual answer to the question.
>
> --
> Richard Urwin, Private
> "No 9000 series computer has ever made a mitsake or corrubiteddatatato."
>
> -----Original Message-----
> From: Jeeva Chelladhurai [mailto:jeeva@xxxxxxxxxxxxxx]
> Sent: 14 November 2001 15:27
> To: ethereal-users@xxxxxxxxxxxx
> Subject: [Ethereal-users] Decode as on Tethereal
>
>
> Hello,
>
> I've to write a TCL script that should capture the TELNET traffic on the
> both TELNET port and non-standard TELNET port (not 23) (the TELNET server
> configured on ports other than 23), decode it as TELNET data and do some
> processing on it...
>
> I am aware of the "Tools::Decode As..." option in ethereal,
> however I do not
> know how to do the same on tethereal (I have to use tethereal because the
> script will be completely automated and text based)...
>
> Is it possible to do force decoding on tethereal, if so how do I do it?
> Otherwise is there any tool that enable me to achieve the same...
>
> Thanks in advance..
>
> Jeeva.
>
>
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