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Subject: FW: [Tsvwg] I-D ACTION:draft-ietf-tsvwg-udp-lite-00.txt
From: "Peter Barany"<pbarany () nortelnetworks ! com>
Date: 2002-01-29 22:02:59
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Hi,
For status of UDP-Lite, see bottom of this e-mail. Thanks.
Regards,
Pete
> So what should I do if I want to use IPv6, which mandates UDP checksums
> and requires receivers to discard UDP packets without checksums (i.e.
> with zero checksum)? I assume that there is also a mandate to discard
> UDP packets whose checksum is wrong, although I don't see that
> explicitly in either the UDP or IPv6 RFCs.
I've been told there is supposed to be work on something called UDP-lite
in TSVWG - the ability to have the UDP checksum cover some number of bytes
in the packet (like e.g. just the pseudo-header, UDP header, and RTP
header).
But I don't know how this work is progressing.
Erik
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------------------------------------------
-----Original Message-----
From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org]
Sent: Monday, January 28, 2002 7:03 AM
Cc: tsvwg@ietf.org
Subject: [Tsvwg] I-D ACTION:draft-ietf-tsvwg-udp-lite-00.txt
A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Transport Area Working Group Working Group
of the IETF.
Title : The UDP Lite Protocol
Author(s) : L. Larzon, M. Degermark
Filename : draft-ietf-tsvwg-udp-lite-00.txt
Pages : 8
Date : 25-Jan-02
This document describes the UDP Lite protocol, which is similar to
classic UDP [RFC-768], but can also serve applications which in lossy
network environments prefer to have partially damaged payloads
delivered rather than discarded. If this feature is not used, UDP
Lite is semantically identical to classic UDP.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-udp-lite-00.txt
To remove yourself from the IETF Announcement list, send a message to
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<P><FONT SIZE=2>Hi,</FONT>
</P>
<P><FONT SIZE=2>For status of UDP-Lite, see bottom of this e-mail. Thanks.</FONT>
</P>
<P><FONT SIZE=2>Regards,</FONT>
</P>
<P><FONT SIZE=2>Pete</FONT>
</P>
<BR>
<P><FONT SIZE=2>> So what should I do if I want to use IPv6, which mandates UDP \
checksums</FONT> <BR><FONT SIZE=2>> and requires receivers to discard UDP packets \
without checksums (i.e.</FONT> <BR><FONT SIZE=2>> with zero checksum)? I assume \
that there is also a mandate to discard</FONT> <BR><FONT SIZE=2>> UDP packets \
whose checksum is wrong, although I don't see that</FONT> <BR><FONT SIZE=2>> \
explicitly in either the UDP or IPv6 RFCs.</FONT> </P>
<P><FONT SIZE=2>I've been told there is supposed to be work on something called \
UDP-lite</FONT> <BR><FONT SIZE=2>in TSVWG - the ability to have the UDP checksum \
cover some number of bytes</FONT> <BR><FONT SIZE=2>in the packet (like e.g. just the \
pseudo-header, UDP header, and RTP header).</FONT> <BR><FONT SIZE=2>But I don't know \
how this work is progressing.</FONT> </P>
<P><FONT SIZE=2> Erik</FONT>
</P>
<P><FONT SIZE=2>--------------------------------------------------------------------</FONT>
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</P>
<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Internet-Drafts@ietf.org [<A \
HREF="mailto:Internet-Drafts@ietf.org">mailto:Internet-Drafts@ietf.org</A>]</FONT> \
<BR><FONT SIZE=2>Sent: Monday, January 28, 2002 7:03 AM</FONT> <BR><FONT SIZE=2>Cc: \
tsvwg@ietf.org</FONT> <BR><FONT SIZE=2>Subject: [Tsvwg] I-D \
ACTION:draft-ietf-tsvwg-udp-lite-00.txt</FONT> </P>
<BR>
<P><FONT SIZE=2>A New Internet-Draft is available from the on-line Internet-Drafts \
directories.</FONT> <BR><FONT SIZE=2>This draft is a work item of the Transport Area \
Working Group Working Group of the IETF.</FONT> </P>
<P> <FONT SIZE=2>Title \
: The UDP Lite Protocol</FONT> \
<BR> <FONT \
SIZE=2>Author(s) : L. Larzon, M. Degermark</FONT> \
<BR> <FONT \
SIZE=2>Filename : \
draft-ietf-tsvwg-udp-lite-00.txt</FONT> \
<BR> <FONT SIZE=2>Pages \
: 8</FONT> \
<BR> <FONT SIZE=2>Date \
: 25-Jan-02</FONT> \
<BR> <BR><FONT SIZE=2>This document \
describes the UDP Lite protocol, which is similar to</FONT> <BR><FONT SIZE=2>classic \
UDP [RFC-768], but can also serve applications which in lossy</FONT> <BR><FONT \
SIZE=2>network environments prefer to have partially damaged payloads</FONT> \
<BR><FONT SIZE=2>delivered rather than discarded. If this feature is not used, \
UDP</FONT> <BR><FONT SIZE=2>Lite is semantically identical to classic UDP.</FONT>
</P>
<P><FONT SIZE=2>A URL for this Internet-Draft is:</FONT>
<BR><FONT SIZE=2><A HREF="http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-udp-lite-00.txt" \
TARGET="_blank">http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-udp-lite-00.txt</A></FONT>
</P>
<P><FONT SIZE=2>To remove yourself from the IETF Announcement list, send a message to \
</FONT> <BR><FONT SIZE=2>ietf-announce-request with the word unsubscribe in the body \
of the message.</FONT> </P>
<P><FONT SIZE=2>Internet-Drafts are also available by anonymous FTP. Login with the \
username</FONT> <BR><FONT SIZE=2>"anonymous" and a password of your e-mail \
address. After logging in,</FONT> <BR><FONT SIZE=2>type "cd \
internet-drafts" and then</FONT> <BR> \
<FONT SIZE=2>"get draft-ietf-tsvwg-udp-lite-00.txt".</FONT> </P>
<P><FONT SIZE=2>A list of Internet-Drafts directories can be found in</FONT>
<BR><FONT SIZE=2><A HREF="http://www.ietf.org/shadow.html" \
TARGET="_blank">http://www.ietf.org/shadow.html</A> </FONT> <BR><FONT SIZE=2>or <A \
HREF="ftp://ftp.ietf.org/ietf/1shadow-sites.txt" \
TARGET="_blank">ftp://ftp.ietf.org/ietf/1shadow-sites.txt</A></FONT> </P>
<BR>
<P><FONT SIZE=2>Internet-Drafts can also be obtained by e-mail.</FONT>
</P>
<P><FONT SIZE=2>Send a message to:</FONT>
<BR> <FONT SIZE=2>mailserv@ietf.org.</FONT>
<BR><FONT SIZE=2>In the body type:</FONT>
<BR> <FONT SIZE=2>"FILE \
/internet-drafts/draft-ietf-tsvwg-udp-lite-00.txt".</FONT> \
<BR> <BR><FONT SIZE=2>NOTE: \
The mail server at ietf.org can return the document in</FONT> \
<BR> <FONT SIZE=2>MIME-encoded form by \
using the "mpack" utility. To use this</FONT> \
<BR> <FONT SIZE=2>feature, insert the \
command "ENCODING mime" before the "FILE"</FONT> \
<BR> <FONT SIZE=2>command. To decode \
the response(s), you will need "munpack" or</FONT> \
<BR> <FONT SIZE=2>a MIME-compliant mail \
reader. Different MIME-compliant mail readers</FONT> \
<BR> <FONT SIZE=2>exhibit different \
behavior, especially when dealing with</FONT> \
<BR> <FONT SIZE=2>"multipart" \
MIME messages (i.e. documents which have been split</FONT> \
<BR> <FONT SIZE=2>up into multiple \
messages), so check your local documentation on</FONT> \
<BR> <FONT SIZE=2>how to manipulate these \
messages.</FONT> <BR> \
\
<BR> \
<BR><FONT SIZE=2>Below is the data which \
will enable a MIME compliant mail reader</FONT> <BR><FONT SIZE=2>implementation to \
automatically retrieve the ASCII version of the</FONT> <BR><FONT \
SIZE=2>Internet-Draft.</FONT> </P>
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