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List:       ietf
Subject:    Re: Unreliable TCP work?
From:       "Randall R. Stewart" <randall () stewart ! chicago ! il ! us>
Date:       2000-10-18 12:22:03
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Sam Liang wrote:
> 
> Hello,
> 
>   I am wondering if there has been any work done on enhancing TCP to allow
> unreliable transmission for real-time applications (audio/video).  Any
> information is appreciated.
> 
> Sam
> 
> sliang@dsg.stanford.edu
Sam:

I will put forth two answers to your question...

First: I don't think TCP is being enhanced to allow
unreliable delivery... 

Second: There is work underway to provide this on a different
venue besides UDP and RTP :). Recently a new transport
protocol SCTP has been approved (you should see a RFC soon). The
protocol has some nice extensions such as:

1) No head of line blocking
2) multi-homing
3) SACK built in to the protocol.
... others please see the following draft (or wait a week or two
and you can look at a RFC .. I hope :->)

http://search.ietf.org/internet-drafts/draft-ietf-sigtran-sctp-13.txt


Now SCTP is quite extensible and there are 3 drafts currently submitted
to sigtran that effect SCTP, one in particular is:

http://search.ietf.org/internet-drafts/draft-xie-usctp-sigtran-00.txt

This adds the ability to transmit data in a SCTP stream unreliably. 

Please have a look at these drafts you may find some interesting
reading :)

R
-- 
Randall R. Stewart
randall@stewart.chicago.il.us or rrs@cisco.com
815-342-5222 (cell) 815-477-2127 (work)

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