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From: Yogesh Prem Swami <yogesh.swami@nokia.com>
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Subject: [Tsvwg] draft-swami-tcp-lmdr-01.txt
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Hello folks,

An update for 'draft-swami-tcp-lmdr-01.txt' is now available from:

http://www.ietf.org/internet-drafts/draft-swami-tcp-lmdr-01.txt

Any comment or suggestion will be highly appreciated.

Thanks

--yogesh



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From exim@www1.ietf.org  Wed Oct  1 17:09:28 2003
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From: Sally Floyd <floyd@icir.org>
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Subject: [Tsvwg] draft-ietf-tsvwg-newreno-01
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At the last IETF, I sent the following email to the mailing
list:

>From the tsvwg meeting at the IETF, now in progress, here are
>the issues to track (in the next week) for WG Last Call,
>for the NewReno TCP:
>
>* Add a note to the section on "Implementation issues for the data 
>sender" saying that the sender might want a separate flag to record
>whether it is in the Fast Recovery procedure, for robustness
>with window updates and out-of-order acks.
>
>* Add an implementation note about taking care of sequence wrap.
>
>* Address the issue raised by Andrei Gurtov about whether
>packets are sent in response to dup acks in those cases
>when Fast Recovery is not invoked (because of bugfix).

We have made changes addressing these issues, and submitted a
revised version of the internet-draft, which is now ready for
Working Group Last Call:
 
http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-01.txt
http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-01.ps

We have made no changes to the basic algorithm specified in 
Section 3 of the draft.

Addressing the third item in the list involved adding a discussion
in Section 6 about possible heuristics that a sender may use for
distinguishing between three dup ACKS from a retransmitted packet
that was dropped, and three dup ACKs simply from the unnecessary
retransmission of three packets.
 
- Sally 
http://www.icir.org/floyd/

To see the diffs, one could use wdiff to compare:

http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-00.txt
http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-01.txt

or compare:

http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-00.nroff
http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-01.nroff


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--NextPart

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 NewReno Modification to TCP's Fast Recovery 
                          Algorithm
	Author(s)	: S. Floyd, T. Henderson, A. Gurtov
	Filename	: draft-ietf-tsvwg-newreno-01.txt,.ps
	Pages		: 20
	Date		: 2003-10-2
	
RFC 2581 [RFC2581] documents the following four intertwined TCP
congestion control algorithms: Slow Start, Congestion Avoidance, Fast
Retransmit, and Fast Recovery.  RFC 2581 [RFC2581] explicitly allows
certain modifications of these algorithms, including modifications
that use the TCP Selective Acknowledgement (SACK) option [RFC2018],
and modifications that respond to 'partial acknowledgments' (ACKs
which cover new data, but not all the data outstanding when loss was
detected) in the absence of SACK.  The NewReno mechanism uses an
algorithm for responding to partial acknowledgments that was first
proposed by Janey Hoe in [Hoe95].

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-newreno-01.txt

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Hello,

An updated DCLOR draft is now available from:

http://www.ietf.org/internet-drafts/draft-swami-tsvwg-tcp-dclor-02.txt

Thanks
Yogesh


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> We have made changes addressing these issues, and submitted a
> revised version of the internet-draft, which is now ready for
> Working Group Last Call:
>  
> http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-01.txt
> http://www.icir.org/floyd/papers/draft-ietf-tsvwg-newreno-01.ps

I read through the document and sent the authors a few minor
comments.  Nothing major.  My opinion is that the document is ready
to go.

allman


--
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From exim@www1.ietf.org  Tue Oct  7 17:18:37 2003
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From: Pekka Savola <pekkas@netcore.fi>
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Hi,

Remember us asking for feedback on the "IPv4 address usage survey" a
couple of weeks ago?

Well, the document has been revised a bit (actually twice :-), and I
believe it should address the comments received:

http://www.ietf.org/internet-drafts/draft-ietf-v6ops-ipv4survey-trans-03.txt

Please check it out and see that it's factually correct, the
recommendations in section 7 seem reasonable, etc.

In particular, we've found a new Full Standard, RFC 907 ("Host Access
Protocol"), which should be analyzed ;-)

Thanks,

Pekka
 writing as v6ops co-chair

---------- Forwarded message ----------
Date: Mon, 06 Oct 2003 11:11:56 -0400
From: Internet-Drafts@ietf.org
To: IETF-Announce:  ;
Cc: v6ops@ops.ietf.org
Subject: I-D ACTION:draft-ietf-v6ops-ipv4survey-trans-03.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IPv6 Operations Working Group of the IETF.

	Title		: Survey of IPv4 Addresses in Currently Deployed IETF
			  Transport Area Standards
	Author(s)	: P. Nesser II, A. Bergstrom
	Filename	: draft-ietf-v6ops-ipv4survey-trans-03.txt
	Pages		: 0
	Date		: 2003-10-6
	
This document seeks to document all usage of IPv4 addresses in currently
deployed IETF Transport Area documented standards.  In order to 
successfully transition from an all IPv4 Internet to an all IPv6 
Internet, many interim steps will be taken. One of these steps is the 
evolution of current protocols that have IPv4 dependencies.  It is hoped 
that these protocols (and their implementations) will be redesigned to 
be network address independent, but failing that will at least dually 
support IPv4 and IPv6.  To this end, all Standards (Full, Draft, and 
Proposed) as well as Experimental RFCs will be surveyed and any 
dependencies will be documented.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-v6ops-ipv4survey-trans-03.txt

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From exim@www1.ietf.org  Tue Oct 14 10:59:32 2003
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Hello!
   We are looking into implementing the TCP-ESTATS-MIB in IETF draft
draft-ietf-tsvwg-tcp-mib-extension-03.txt.  We wondered what the status of
this draft was.  Is the WG still updating this MIB and will there be a new
version soon (maybe for the November IETF meeting)??  Thanks,

Kristine Adamson
IBM Communications Server for MVS: TCP/IP Development
Internet e-mail:adamson@us.ibm.com


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--NextPart

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		: Using TCP DSACKs and SCTP Duplicate TSNs to Detect 
			  Spurious Retransmissions
	Author(s)	: E. Blanton, M. Allman
	Filename	: draft-ietf-tsvwg-dsack-use-02.txt
	Pages		: 7
	Date		: 2003-10-14
	
TCP and SCTP provide notification of duplicate segment receipt
through DSACK and Duplicate TSN notification, respectively. This
document presents a conservative method of using this information to
identify unnecessary retransmissions for various applications.

A URL for this Internet-Draft is:
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Sourabh Ladha surfaced two issues with the dsack-use draft during
last call.  Ethan and I updated the draft (which is now
draft-ietf-tsvwg-dsack-use-02.txt in the archives) per the following.

>    * In the draft the following is about the SACK scoreboard: "We
>    assume the TCP sender has a data structure to hold selective
>    acknowledgment information (e.g., as outlined in [RFC3517])."
> 
>    Traditionally entries lying below the cumulative ACK point are
>    deleted from the scoreboard. But the DSACK information normally
>    comes after loss recovery has exited. So how long should the
>    scoreboard entries be maintained beyond what is required in
>    3517? (1 ACK after loss recovery exits in Fast retransmit; and
>    N Acks after loss recovery exits in a timeout (GoBackN)?)

Good catch.  We added a note that to use the scheme outlinedin the
draft a TCP implementation would have to keep more history in the
scoreboard. 

>    * In the Security Considerations, ECN Nonce 3540 is offered as
>      a protection. But 3540 calls for disabling Nonce Sum checks
>      for DupAcks. Is the draft suggesting some extension to 3540
>      that NS be checked for DupAcks carrying DSACK?

Also a good call.  We added some wiggle words to the draft.  That
is, per the above, the ECN nonce is not directly applicable to the
problem of preventing misleading DSACK (/DupTSN) notifications.
However, the principles of the ECN nonce are applicable and if we
found that protection against lying receivers to be necessary then
we could likely build something from the ECN nonce foundation.

allman


--
Mark Allman -- ICIR -- http://www.icir.org/mallman/

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From: "Peterson, Jon" <jon.peterson@neustar.biz>
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Please contact myself and Allison if you have a draft you would like to
present during  the TSVWG meeting in Minneapolis.

Jon Peterson
NeuStar, Inc.

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From exim@www1.ietf.org  Fri Oct 17 09:34:30 2003
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From: "Narasimha Reddy" <reddy@ee.tamu.edu>
To: <tsvwg@ietf.org>
Date: Fri, 17 Oct 2003 08:33:24 -0500
Organization: Texas A & M University
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We have just submitted a draft for modifying TCP to allow smoother
handling of non-congestion events such as wireless channel errors and
packet reordering. The draft can be found at
http://www.ietf.org/internet-drafts/draft-tcp-dcr-00.txt .

Comments/suggestions/discussion/criticism welcome.
Regards,
Reddy 

A. L. Narasimha Reddy                Phone:979-845-7598
Texas A & M University               Fax:    979-845-2630
214 Zachry                           email:  reddy@ee.tamu.edu
College Station, TX 77843-3128       http://ee.tamu.edu/~reddy





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From exim@www1.ietf.org  Sun Oct 19 12:27:30 2003
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Cc: Randall Stewart (cisco) <rrs@cisco.com>
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Dear all,

I would like to let you know that I have submitted a new ID from
Randall Stewart and myself regarding an SCTP extension for chunk
authentication.

It is also available at
http://www.sctp.de/internet-drafts.html

Best regards
Michael


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Dear all,

I would like to let you know that I have submitted a new ID from
Michael Tuexen, Peter Lei and myself  regarding a new SCTP extension
that deals with packet drops due to NON congestion events especially
in high loss long delay type networks (satellites and radio come to mind :>)

It is also available at:

http://www.sctp.org

(follow the RFCs and I-D's link and you can access both this
 draft and the authentication draft that Michael earlier announced .. as 
well
 as the current other SCTP drafts ... PR-SCTP/ADD-IP et.al)

Regards

R

-- 
Randall R. Stewart
randall@stewart.chicago.il.us 815-342-5222 (cell phone)



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From: "Peterson, Jon" <jon.peterson@neustar.biz>
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The chairs would like to announce a two-week Working Group Last Call for
draft-ietf-tsvwg-newreno-01, commencing on October 20th and concluding on
November 3rd. Please send any final comments relating to this document to
the TSVWG mailing list.

Jon Peterson
NeuStar, Inc.

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From: Reiner Ludwig <Reiner.Ludwig@ericsson.com>
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Subject: [Tsvwg] Eifel Response -04
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Hi,

we have just submitted a new revision (-04) of the I-D specifying the Eifel 
Response algorithm. It should be online soon.

As announced at the last IETF meeting, it now only deals with spurious 
timeouts leaving spurious fast retransmits and the question of how to adapt 
DupThresh for further study.

However, as opposed to what we presented at the last IETF meeting, we do 
not require a decaying of the congestion control state. This is a result of 
further private discussions, and we motivate this decision in the I-D 
(section 3.2 & 3.4). Instead of decaying the congestion control state, we 
follow RFC2861 in that ssthresh is restored to a previous state and cwnd 
has to be revalidated through slow-start. [This is basically what had 
already been specified in the -03 version of the I-D. Now, we are just more 
explicit about it.]

///Andrei & Reiner


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From exim@www1.ietf.org  Mon Oct 20 14:25:33 2003
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From: Linus Walleij <triad@df.lth.se>
To: tsvwg@ietf.org
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Subject: [Tsvwg] XML DTD for RFC:s storage situation
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I have observed a phenomenon that I need to discuss with the TSVWG. In
some recently published RFC:s, XML is used to define transport formats.
The XML structure is specified in DTD:s, and the DTD:s are identified with
a generic IETF name and an URI.

The problem I've seen is that these URI:s, references in RFC:s are dying.
Take for example:

RFC3080 "BEEP": http://xml.resource.org/profiles/BEEP/beep.dtd (p 47)
RFC3367 "CNRP": http://ietf.org/dtd/cnrp-1.0.dtd (p 28)

None of these URI:s are in existance. The DTD:s cannot be retrieved from
these addresses. Now, I am writing an I-D, and the logical assumption
would be that the DTD should be stored at some ietf.ord/dtd/foo.dtd-like
URI. But these things doesn't seem to work in practice.

What is the correct way of referring to an IETF DTD, and where is it to be
stored? And who is to be communicated in order to have something actually
being deposited at ietf.org/dtd/foo.dtd?

See also the W3 URI "policy":
http://www.w3.org/Provider/Style/URI

Yours,
Linus Walleij


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From exim@www1.ietf.org  Mon Oct 20 16:29:38 2003
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Linus Walleij wrote:

> I have observed a phenomenon that I need to discuss with the TSVWG. In
> some recently published RFC:s, XML is used to define transport formats.
> The XML structure is specified in DTD:s, and the DTD:s are identified with
> a generic IETF name and an URI.
> 
> The problem I've seen is that these URI:s, references in RFC:s are dying.
> Take for example:
> 
> RFC3080 "BEEP": http://xml.resource.org/profiles/BEEP/beep.dtd (p 47)
> RFC3367 "CNRP": http://ietf.org/dtd/cnrp-1.0.dtd (p 28)
> 
> None of these URI:s are in existance. The DTD:s cannot be retrieved from
> these addresses. Now, I am writing an I-D, and the logical assumption
> would be that the DTD should be stored at some ietf.ord/dtd/foo.dtd-like
> URI. But these things doesn't seem to work in practice.
> 
> What is the correct way of referring to an IETF DTD, and where is it to be
> stored? And who is to be communicated in order to have something actually
> being deposited at ietf.org/dtd/foo.dtd?
> 
> See also the W3 URI "policy":
> http://www.w3.org/Provider/Style/URI
> 
> Yours,
> Linus Walleij

Is there some reason the DTD shouldn't be included in an appendix to the 
RFC? That would at least solve the issue of its disappearance.

Joe




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From exim@www1.ietf.org  Mon Oct 20 19:30:26 2003
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From: Hosei Matsuoka <matsuoka@spg.yrp.nttdocomo.co.jp>
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Dear all,

We submitted a draft for multi-link transport that use
multiple wireless links in a connection simultaneously.
For efficient and adaptive data striping, multi-stream senders
need some more information about the receiver's links.
We would like to share this perspective here.

The draft is available at
http://www.spg.yrp.nttdocomo.co.jp/draft-matsuoka-multilink-transport-00.txt

Best regards.
--
Hosei Matsuoka <matsuoka@spg.yrp.nttdocomo.co.jp>
Multimedia Laboratories, NTT DoCoMo


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From exim@www1.ietf.org  Mon Oct 20 20:05:27 2003
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Date: Mon, 20 Oct 2003 17:02:54 -0700
From: Kacheong Poon <kacheong.poon@sun.com>
Organization: Sun Microsystems, Inc.
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Subject: [Tsvwg] Proposed changes in the SCTP socket API draft
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There is one notable change in the version 7 of SCTP socket
API draft on how list of IP addresses are represented.  A
packed array of structures is used instead of an array
of fixed size structures.  Besides the fact that it is
incompatible with the previous drafts, it causes
portability issues and is quite inefficient to
implement.  Unfortunately, the incompatible change was
not discussed in any mailing list before it was made.

In light of the issues and the desire to save memory used
in some operating systems, I propose the following
change in how list of IP addresses are represented in the
draft.

int sctp_bindx(int sd, const void *ipaddrs, int addrcnt,
     int flags);

The parameter ipaddrs is either an array of struct in_addr
if sd is a v4 socket or an array of struct in6_addr if
the sd is a v6 socket (v4 address is represented as mapped
address).  This can save memory and copying cost (even more
than that in version 7) for this call and should not
have any portability issue across platforms with different
alignment requirements.  This also follows the fact that
SCTP cares about IP addresses, not socket addresses (there
is no need to replicate some info, such as port).  This
representation of list of IP addresses also applies to
sctp_getladdrs(), sctp_getpaddrs(), and sctp_connectx().

A variant of the above which can be implemented as a
replacement of bind() can be defined like

int sctp_bindx(int sd, const struct sockaddr *addr, int len,
     const void *ipaddrs, int addrcnt, int flags);

The additional parameters addr and len are the equivalents
of what should be passed in the bind() call.

Please comment on these changes.  I know that the IETF
is near so these changes may not be discussed in the next
IETF.  But do make suggestions on the above.  Thanks.

-- 

						K. Poon.
						kacheong.poon@sun.com



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To: tsvwg@ietf.org
From: Hosei Matsuoka <matsuoka@docomolabs-usa.com>
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Dear all,

We submitted a draft for multi-link transport that use
multiple wireless links in a connection simultaneously.
For efficient and adaptive data striping, multi-stream senders
need some more information about the receiver's links.
We would like to share this perspective here.

The draft is also available at
http://www.spg.yrp.nttdocomo.co.jp/draft-matsuoka-multilink-transport-00.txt

Best regards.
--
Hosei Matsuoka <matsuoka@docomolabs-usa.com>
Multimedia Laboratories, NTT DoCoMo


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Date: Mon, 20 Oct 2003 16:03:07 -0700
From: Marshall Rose <mrose+mtr.netnews@dbc.mtview.ca.us>
To: Joe Touch <touch@ISI.EDU>
Cc: Linus Walleij <triad@df.lth.se>, tsvwg@ietf.org
Subject: Re: [Tsvwg] XML DTD for RFC:s storage situation
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> Is there some reason the DTD shouldn't be included in an appendix to the 
> RFC? That would at least solve the issue of its disappearance.

the DTD is in the RFCs.

the confusion, i think, is this: those documents use URIs not for dereferencing
but for uniqueness.

as an aside, in the applications area, this topic arises about every three
months. perhaps it is time for someone to raise it there...

/mtr

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Kacheong:

I guess I am missing something on the "packed array"

If you are in IPv6 you send an array of
sockaddr_in6 (with IPv4 mapped to V6)

If you are in IPv4 you get send an array of
sockaddr_in's

I am not sure packed array is the right terminlogy.. but I do
see that the array of sockaddr_in6 will cause a 64 bit alignment
error.

But will not your array of in_addr's also cause 64 bit aligment issues
as well.. and of course you will loose the ability to call
sctp_bindx() by itself and forever need to call

bind()
sctp_bindx()

I would think you would want to at least add a port number so I
only have one call to make...

But I am not sure I see the advantage of sending arry's of in_addr or
in6_addr vs arry's of sockaddr_in and sockaddr_in6...

It could save us a few bytes in the kernel to user space transition though..

R

Kacheong Poon wrote:

> There is one notable change in the version 7 of SCTP socket
> API draft on how list of IP addresses are represented.  A
> packed array of structures is used instead of an array
> of fixed size structures.  Besides the fact that it is
> incompatible with the previous drafts, it causes
> portability issues and is quite inefficient to
> implement.  Unfortunately, the incompatible change was
> not discussed in any mailing list before it was made.
>
> In light of the issues and the desire to save memory used
> in some operating systems, I propose the following
> change in how list of IP addresses are represented in the
> draft.
>
> int sctp_bindx(int sd, const void *ipaddrs, int addrcnt,
>     int flags);
>
> The parameter ipaddrs is either an array of struct in_addr
> if sd is a v4 socket or an array of struct in6_addr if
> the sd is a v6 socket (v4 address is represented as mapped
> address).  This can save memory and copying cost (even more
> than that in version 7) for this call and should not
> have any portability issue across platforms with different
> alignment requirements.  This also follows the fact that
> SCTP cares about IP addresses, not socket addresses (there
> is no need to replicate some info, such as port).  This
> representation of list of IP addresses also applies to
> sctp_getladdrs(), sctp_getpaddrs(), and sctp_connectx().
>
> A variant of the above which can be implemented as a
> replacement of bind() can be defined like
>
> int sctp_bindx(int sd, const struct sockaddr *addr, int len,
>     const void *ipaddrs, int addrcnt, int flags);
>
> The additional parameters addr and len are the equivalents
> of what should be passed in the bind() call.
>
> Please comment on these changes.  I know that the IETF
> is near so these changes may not be discussed in the next
> IETF.  But do make suggestions on the above.  Thanks.
>


-- 
Randall R. Stewart
ITD
Cisco Systems Inc.
rrs@cisco.com 815-342-5222(cell) or 815-477-2127(office)



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Date: Tue, 21 Oct 2003 16:59:45 +0200 (MEST)
From: Linus Walleij <triad@df.lth.se>
To: tsvwg@ietf.org
Subject: Re: [Tsvwg] XML DTD for RFC:s storage situation
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On Mon, 20 Oct 2003, Marshall Rose wrote:

> > Is there some reason the DTD shouldn't be included in an appendix to the
> > RFC? That would at least solve the issue of its disappearance.
>
> the DTD is in the RFCs.

Yes the DTD is in the RFCs. The point raised is technical: a validating
XML parser can not read RFC:s, it will dereference the URI given, if
given. It *MAY* have precompiled the IETF global entries (e.g. looking in
it's own program code to see if it has a PUBLIC "-//IETF//DTD BEEP//EN"
root type) but if this implementation doesn't, it *MAY* try to find it
using the URI.

Bottom line: the URI in the DTD is for machines, not humans. If it is not
present, validating machines will break.

Why hasn't it yet caused any problems? Nobody validates their XML files
(for performance, I guess). But it is sure permitted to do so, and the
URI:s should be resolvable.

RFC 3080 says:

Refer to this DTD as:

  <!ENTITY % BEEP PUBLIC "-//IETF//DTD BEEP//EN"
             "http://xml.resource.org/profiles/BEEP/beep.dtd">
   %BEEP;

And currently this will break almost any validating XML parser.

If this should be in the application area, fine, but I think it is a
transport matter too.

I am ready to write up an RFC saying that DTD:s *shall* be stored at
ietf.org/dtd if you want to. It could resolve this issue, but would
require additional administration from the IETF. Still, it seems like the
only reasonable thing to do.

Linus

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From: Kacheong Poon <kacheong.poon@sun.com>
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To: "Randall Stewart (cisco)" <rrs@cisco.com>
CC: tsvwg@ietf.org, "Sctp-Impl (E-mail)" <sctp-impl@external.cisco.com>
Subject: Re: [Tsvwg] Re: Proposed changes in the SCTP socket API draft
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Randall Stewart (cisco) wrote:

> I guess I am missing something on the "packed array"
> 
> If you are in IPv6 you send an array of
> sockaddr_in6 (with IPv4 mapped to V6)

This is not what is specified in the v7 draft.  Please
read it again.

What you are saying above is indeed not a packed array.
But it is also incompatible with what is specified in
the v7 draft.  The point I am trying to make is we should
get rid of packed array.

> If you are in IPv4 you get send an array of
> sockaddr_in's
> 
> I am not sure packed array is the right terminlogy.. but I do
> see that the array of sockaddr_in6 will cause a 64 bit alignment
> error.
> 
> But will not your array of in_addr's also cause 64 bit aligment issues
> as well.. and of course you will loose the ability to call
> sctp_bindx() by itself and forever need to call
> 
> bind()
> sctp_bindx()
> 
> I would think you would want to at least add a port number so I
> only have one call to make...

Check the variant in my previous mail.  It includes a socket
address, which includes the port number.

> But I am not sure I see the advantage of sending arry's of in_addr or
> in6_addr vs arry's of sockaddr_in and sockaddr_in6...
> 
> It could save us a few bytes in the kernel to user space transition 
> though..

My main objection is the packed array.  If people really
like to waste space with duplicate info (such as port),
I am fine with that.  But from what I heard, the main
reason for the incompatible v7 changes was because of
memory usage in copying the sockaddr_storage array.
I guess people will really like to save more space.



-- 

						K. Poon.
						kacheong.poon@sun.com



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Subject: Re: [Tsvwg] Re: Proposed changes in the SCTP socket API draft
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Kacheong Poon wrote:

> Randall Stewart (cisco) wrote:
>
>> I guess I am missing something on the "packed array"
>>
>> If you are in IPv6 you send an array of
>> sockaddr_in6 (with IPv4 mapped to V6)
>
>
> This is not what is specified in the v7 draft.  Please
> read it again.
>
> What you are saying above is indeed not a packed array.
> But it is also incompatible with what is specified in
> the v7 draft.  The point I am trying to make is we should
> get rid of packed array.
>
>> If you are in IPv4 you get send an array of
>> sockaddr_in's
>>
>> I am not sure packed array is the right terminlogy.. but I do
>> see that the array of sockaddr_in6 will cause a 64 bit alignment
>> error.
>>
>> But will not your array of in_addr's also cause 64 bit aligment issues
>> as well.. and of course you will loose the ability to call
>> sctp_bindx() by itself and forever need to call
>>
>> bind()
>> sctp_bindx()
>>
>> I would think you would want to at least add a port number so I
>> only have one call to make...
>
>
> Check the variant in my previous mail.  It includes a socket
> address, which includes the port number.
>
>> But I am not sure I see the advantage of sending arry's of in_addr or
>> in6_addr vs arry's of sockaddr_in and sockaddr_in6...
>>
>> It could save us a few bytes in the kernel to user space transition 
>> though..
>
>
> My main objection is the packed array.  If people really
> like to waste space with duplicate info (such as port),
> I am fine with that.  But from what I heard, the main
> reason for the incompatible v7 changes was because of
> memory usage in copying the sockaddr_storage array.
> I guess people will really like to save more space.
>
>
>
a sockaddr storage is 256 bytes.
a sockaddr_in is 16 bytes
and
a sockaddr_in6 is 28 bytes

I can put 9 sockaddr_in6's in a sockaddr_storage structure
I can put 16 sockaddr_in's in a sockaddr_storage structure

There is an extreme magnitude of difference between the
sockaddr_inX and sockaddr_storage sizes..

I will take a look at the v7 draft again.. it seems to me the word you
are hostile to is packed.. and I think we can easily take that word
out of the document...

R

-- 
Randall R. Stewart
ITD
Cisco Systems Inc.
rrs@cisco.com 815-342-5222(cell) or 815-477-2127(office)



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Linus Walleij wrote:

> On Mon, 20 Oct 2003, Marshall Rose wrote:
> 
> 
>>>Is there some reason the DTD shouldn't be included in an appendix to the
>>>RFC? That would at least solve the issue of its disappearance.
>>
>>the DTD is in the RFCs.
> 
> 
> Yes the DTD is in the RFCs. The point raised is technical: a validating
> XML parser can not read RFC:s, it will dereference the URI given, if
> given. It *MAY* have precompiled the IETF global entries (e.g. looking in
> it's own program code to see if it has a PUBLIC "-//IETF//DTD BEEP//EN"
> root type) but if this implementation doesn't, it *MAY* try to find it
> using the URI.
> 
> Bottom line: the URI in the DTD is for machines, not humans. If it is not
> present, validating machines will break.
> 
> Why hasn't it yet caused any problems? Nobody validates their XML files
> (for performance, I guess). But it is sure permitted to do so, and the
> URI:s should be resolvable.
> 
> RFC 3080 says:
> 
> Refer to this DTD as:
> 
>   <!ENTITY % BEEP PUBLIC "-//IETF//DTD BEEP//EN"
>              "http://xml.resource.org/profiles/BEEP/beep.dtd">
>    %BEEP;
> 
> And currently this will break almost any validating XML parser.
> 
> If this should be in the application area, fine, but I think it is a
> transport matter too.
> 
> I am ready to write up an RFC saying that DTD:s *shall* be stored at
> ietf.org/dtd if you want to. It could resolve this issue, but would
> require additional administration from the IETF. Still, it seems like the
> only reasonable thing to do.
> 
> Linus

The IETF might not be the best place for these. RFCs are authoritatively 
maintianed by the RFC Editor; protocol registries are maintained by IANA.

This sounds closer to an IANA registry than anything else.

Joe


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--NextPart

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		: F-RTO: An Algorithm for Detecting Spurious 
			  Retransmission Timeouts with TCP and SCTP
	Author(s)	:  P. Sarolahti
	Filename	: draft-ietf-tsvwg-tcp-frto-00.txt
	Pages		: 18
	Date		: 2003-10-23
	
Spurious retransmission timeouts (RTOs) cause suboptimal TCP
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Jon-

> The chairs would like to announce a two-week Working Group Last
> Call for draft-ietf-tsvwg-newreno-01, commencing on October 20th
> and concluding on November 3rd. Please send any final comments
> relating to this document to the TSVWG mailing list.

I have read through the draft and think it should go forward.

(fwiw)

allman


--
Mark Allman -- ICSI/ICIR -- http://www.icir.org/mallman/

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From exim@www1.ietf.org  Mon Oct 27 17:06:31 2003
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To: "Peterson, Jon" <jon.peterson@neustar.biz>, mankin@psg.com
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From: Sally Floyd <floyd@icir.org>
Date: Mon, 27 Oct 2003 14:05:12 -0800
Subject: [Tsvwg] draft-ietf-tsvwg-slowstart-00.txt
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Jon and Allison -

When I asked for WG Last Call on the highspeed TCP document
back in July, I meant to also ask for WG Last Call on the companion
document on Limited Slow-start.  This is draft-ietf-tsvwg-slowstart-00.txt,
"Limited Slow-Start for TCP with Large Congestion Windows",
at
"http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-slowstart-00.txt".

(This is my fault. In my July 29 email to you asking for
WG Last Call for draft-ietf-tsvwg-highspeed-00.txt, I forgot
to mention draft-ietf-tsvwg-slowstart-00.txt.)

This is a very small document suggesting an optional modification
to TCP's slow-start to limit the amount of the increase in the
congestion window from one RTT to another during slow-start, and
I talked about it in presentations at tsvwg, so I don't think
it needs to be talked about at tsvwg again.  I think that
a WG Last Call would probably be sufficient.

Many thanks, and apologies for the hassle...

- Sally
http://www.icir.org/floyd/

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From exim@www1.ietf.org  Tue Oct 28 00:43:22 2003
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From: "Peterson, Jon" <jon.peterson@neustar.biz>
To: "'Sally Floyd'" <floyd@icir.org>, mankin@psg.com
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No problem. We'll announce a WGLC on the slowstart draft shortly.

Jon Peterson
NeuStar, Inc.

> -----Original Message-----
> From: Sally Floyd [mailto:floyd@icir.org]
> Sent: Monday, October 27, 2003 2:05 PM
> To: Peterson, Jon; mankin@psg.com
> Cc: tsvwg@ietf.org
> Subject: draft-ietf-tsvwg-slowstart-00.txt
> 
> 
> Jon and Allison -
> 
> When I asked for WG Last Call on the highspeed TCP document
> back in July, I meant to also ask for WG Last Call on the companion
> document on Limited Slow-start.  This is 
> draft-ietf-tsvwg-slowstart-00.txt,
> "Limited Slow-Start for TCP with Large Congestion Windows",
> at
> "http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-slowstart-00.txt".

(This is my fault. In my July 29 email to you asking for
WG Last Call for draft-ietf-tsvwg-highspeed-00.txt, I forgot
to mention draft-ietf-tsvwg-slowstart-00.txt.)

This is a very small document suggesting an optional modification
to TCP's slow-start to limit the amount of the increase in the
congestion window from one RTT to another during slow-start, and
I talked about it in presentations at tsvwg, so I don't think
it needs to be talked about at tsvwg again.  I think that
a WG Last Call would probably be sufficient.

Many thanks, and apologies for the hassle...

- Sally
http://www.icir.org/floyd/

_______________________________________________
tsvwg mailing list
tsvwg@ietf.org
https://www1.ietf.org/mailman/listinfo/tsvwg



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At the IETF 56 TRIGTRAN BoF, we got positive feedback on doing an
end-to-end notification for link-up, using end-to-end implicit
notifications. We've finally written this up - the draft was announced
at
http://www.ietf.org/mail-archive/ietf-announce/Current/msg26924.html,
and is available at
http://www.ietf.org/internet-drafts/draft-dawkins-trigtran-linkup-01.txt.

This documents a protocol change proposed in the PILC LINK document
(draft-ietf-pilc-link-design-13.txt), since the PILC WG is not
chartered to proposal protocol changes.

Since this notification has no resemblance to the notifications under
discussion in TRIGTRAN, ALIAS, or DNA, we'd like to discuss it on
TSVWG, as agreed with Jon and Allison a long time ago.

Please fire away!

Spencer, for Spencer and Carl


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--NextPart

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 Eifel Response Algorithm for TCP
	Author(s)	: R. Ludwig, A. Gurtov
	Filename	: draft-ietf-tsvwg-tcp-eifel-response-04.txt
	Pages		: 11
	Date		: 2003-10-30
	
The Eifel response algorithm requires a detection algorithm to detect
a posteriori whether the TCP sender has entered loss recovery
unnecessarily. In response to a spurious timeout it adapts the
retransmission timer to avoid further spurious timeouts, and can
avoid - depending on the detection algorithm - the often unnecessary
go-back-N retransmits that would otherwise be sent. Likewise, it
adapts the duplicate acknowledgement threshold in response to a
spurious fast retransmit. In both cases, the Eifel response algorithm
restores the congestion control state in such a way that packet
bursts are avoided.

A URL for this Internet-Draft is:
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From: Bill Sommerfeld <sommerfeld@east.sun.com>
To: Pekka Savola <pekkas@netcore.fi>
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In-Reply-To: Your message of "Thu, 30 Oct 2003 22:14:24 +0200."
             <Pine.LNX.4.44.0310302202340.22649-100000@netcore.fi> 
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Date: Thu, 30 Oct 2003 16:22:44 -0500
Subject: [Tsvwg] Re: TCP and ICMP soft-errors in IPv4/6 environments
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> Has this been discussed in the transport area?  Is there something to be 
> done about this, e.g. a BCP document discussing this practice and 
> suggesting ICMP DU's are OK when establishing connections -- or something 
> else?

Maybe the right answer here is a "slewed parallel" connection
establishment; start with one address, and if you get a soft error or
a RTO-sized timeout, try a second, third, fourth, etc., connection,
but leave the prior ones open in the event they complete successfully.

Soft errors wouldn't kill the first connection -- they'd just be a a
hint to try another connection in parallel.

This should probably be buried in a library routine so that
applications don't have to reinvent this wheel.

					- Bill

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From exim@www1.ietf.org  Fri Oct 31 03:14:55 2003
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Date: Thu, 30 Oct 2003 22:14:24 +0200 (EET)
From: Pekka Savola <pekkas@netcore.fi>
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Subject: [Tsvwg] TCP and ICMP soft-errors in IPv4/6 environments
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Hi,

(Targeted at Transport area, v6ops is there just to keep v6ops in the
loop, this has already been discussed there at some length..)

With dual-stack IPv4/6 deployments, when a TCP connection is tried to both
an IPv6 and IPv4 address, these are done in serial w/ a getaddrinfo loop
(in the typical case).  If the first destination is unreachable (e.g.
resulting in a host unreachable ICMPv6 message).  

The old host requirements document states that TCP MUST NOT abort
connections on such soft errors. However, this poses some problems in
current deployments where multiple addresses are tried sequentially, as
summarized above.

This is discussed more in section 2.3 of:

http://www.ietf.org/internet-drafts/draft-ietf-v6ops-v6onbydefault-00.txt

Has this been discussed in the transport area?  Is there something to be 
done about this, e.g. a BCP document discussing this practice and 
suggesting ICMP DU's are OK when establishing connections -- or something 
else?

Pekka
 Writing as v6ops co-chair

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings




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Date: Fri, 31 Oct 2003 09:27:43 +0100
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From: Reiner Ludwig <Reiner.Ludwig@ericsson.com>
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Subject: [Tsvwg] Re: I-D ACTION:draft-ietf-tsvwg-tcp-eifel-response-04.txt
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Just to avoid confusion ...

Apparently the -04 version of this I-D was announced with the abstract of 
the -03 version. This is the correct abstract:

    Based on an appropriate detection algorithm, the Eifel response
    algorithm provides a way for a TCP sender to respond to a detected
    spurious timeout. It adapts the retransmission timer to avoid further
    spurious timeouts, and can avoid - depending on the detection
    algorithm - the often unnecessary go-back-N retransmits that would
    otherwise be sent. In addition, the Eifel response algorithm restores
    the congestion control state in such a way that packet bursts are
    avoided.

The 
linkhttp://www.ietf.org/internet-drafts/draft-ietf-tsvwg-tcp-eifel-response-04.txt
is correct, though.

///Reiner

At 21:02 30.10.2003, you wrote:
>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 Eifel Response Algorithm for TCP
>         Author(s)       : R. Ludwig, A. Gurtov
>         Filename        : draft-ietf-tsvwg-tcp-eifel-response-04.txt
>         Pages           : 11
>         Date            : 2003-10-30
>
>The Eifel response algorithm requires a detection algorithm to detect
>a posteriori whether the TCP sender has entered loss recovery
>unnecessarily. In response to a spurious timeout it adapts the
>retransmission timer to avoid further spurious timeouts, and can
>avoid - depending on the detection algorithm - the often unnecessary
>go-back-N retransmits that would otherwise be sent. Likewise, it
>adapts the duplicate acknowledgement threshold in response to a
>spurious fast retransmit. In both cases, the Eifel response algorithm
>restores the congestion control state in such a way that packet
>bursts are avoided.
>
>A URL for this Internet-Draft is:
>http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-tcp-eifel-response-04.txt
>
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From exim@www1.ietf.org  Fri Oct 31 18:08:28 2003
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From: "Hanping Long" <hanl@ccpu.com>
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Date: Fri, 31 Oct 2003 03:07:02 -0800
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Subject: [Tsvwg] one-to-many/one-to-one socket API extension for SCTP
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Hi,

Regarding the one-to-many(UDP style) and one-to-one(tcp style) socket
interface in socket API, one-to-many is more effiencient in terms of
exploring the new features of SCTP, can anyone tell me which feature that
one-to-one style interface CANNOT make use of?

Though each association could have its dedicated buffer space for
one-to-many style API, all the associations will fail if their related
socket fails. But if one socket fails for one-to-one style API, only one
association will fail. Is this the benefit of one-to-one style API? or it's
not possible in reality?

But for one-to-one style, the maximum number of associations is limited by
the number of socket the specific OS allows to open, as well as the select()
call could handle(the value of FD_SETSIZE).

Any suggestion or idea is highly appreciated!

hanping



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Subject: [Tsvwg] socket API extension for SCTP checksum
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Hi,

The SCTP checksum is migrating from Adler32 to CRC32. During the transient
phase, these two check will be co-existing.

I am wondering if we could add a preprocessor for the checksum type so that
the user could choose to inter-op with old SCTP implementation only
supporting Adaler32 if necessary.

thanks,
hanping


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From exim@www1.ietf.org  Fri Oct 31 21:35:24 2003
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Date: Fri, 31 Oct 2003 19:34:20 -0700
From: "Brian F. G. Bidulock" <bidulock@openss7.org>
To: Hanping Long <hanl@ccpu.com>
Cc: lksctp-developers@lists.sourceforge.net, tsvwg@ietf.org
Subject: Re: [Tsvwg] socket API extension for SCTP checksum
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Hanping,

Adler32 is deprecated.

--brian

On Fri, 31 Oct 2003, Hanping Long wrote:

> Hi,
>=20
> The SCTP checksum is migrating from Adler32 to CRC32. During the transi=
ent
> phase, these two check will be co-existing.
>=20
> I am wondering if we could add a preprocessor for the checksum type so =
that
> the user could choose to inter-op with old SCTP implementation only
> supporting Adaler32 if necessary.
>=20
> thanks,
> hanping
>=20
>=20
> _______________________________________________
> tsvwg mailing list
> tsvwg@ietf.org
> https://www1.ietf.org/mailman/listinfo/tsvwg

--=20
Brian F. G. Bidulock    =A6 The reasonable man adapts himself to the =A6
bidulock@openss7.org    =A6 world; the unreasonable one persists in  =A6
http://www.openss7.org/ =A6 trying  to adapt the  world  to himself. =A6
                        =A6 Therefore  all  progress  depends on the =A6
                        =A6 unreasonable man. -- George Bernard Shaw =A6

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