Re: Embedded IAC's in the 3270 data stream

Ian Duncan <id@cc.mcgill.ca> Mon, 18 April 1994 21:02 UTC

Received: from ietf.nri.reston.va.us by IETF.CNRI.Reston.VA.US id aa08514; 18 Apr 94 17:02 EDT
Received: from CNRI.RESTON.VA.US by IETF.CNRI.Reston.VA.US id aa08510; 18 Apr 94 17:02 EDT
Received: from list.nih.gov by CNRI.Reston.VA.US id aa25667; 18 Apr 94 17:02 EDT
Received: from LIST.NIH.GOV by LIST.NIH.GOV (IBM VM SMTP V2R2) with BSMTP id 7548; Mon, 18 Apr 94 17:00:25 EDT
Received: from LIST.NIH.GOV by LIST.NIH.GOV (Mailer R2.10 ptf000) with BSMTP id 7547; Mon, 18 Apr 94 16:49:20 EDT
Date: Mon, 18 Apr 1994 10:37:37 -0400
Reply-To: IETF TN3270E Working Group List <TN3270E@list.nih.gov>
X-Orig-Sender: IETF TN3270E Working Group List <TN3270E@list.nih.gov>
Comments: Warning -- original Sender: tag was id@ICE.CC.MCGILL.CA
Sender: ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Ian Duncan <id@cc.mcgill.ca>
Subject: Re: Embedded IAC's in the 3270 data stream
X-To: IETF TN3270E Working Group List <TN3270E@LIST.NIH.GOV>
To: Multiple recipients of list TN3270E <TN3270E@list.nih.gov>
In-Reply-To: <199404161408.KAA03298@sifon.CC.McGill.CA>
Message-ID: <9404181702.aa25667@CNRI.Reston.VA.US>

On Sat, 16 Apr 1994 09:29:38 -0400, Gautam Nandy i wrote:


>             [...]   I do not
> know of any added functionality I can provide with this additional
> su  IAC support (except possibly ATTN and SYSREQ).  Can someone please
> explain why do I need it ?
>
> Thanks for the help.
>
> Bud Biswas. dtix@delphi.com (digital Technology)

The applications layer host requirements standard (RFC1123) is quite
unambiguous about MUST and SHOULD on IAC command processing. I don't
expect any telnet extensions which play fast and loose with this will
pass though IETF review.

I do think some tightening up of when to send various IAC commands with
should/should-not type language is a great idea. However there's some
danger that lazy implementors will code reading 'should' as 'must' and
make us broken toys.

   ...   ian   <id@cc.mcgill.ca>;
Ian Duncan  ---  McGill University Computing Centre  ---  +.514.398.3710