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Telechat Review of draft-ietf-6renum-gap-analysis-07

Request Review of draft-ietf-6renum-gap-analysis
Requested revision No specific revision (document currently at 08)
Type Telechat Review
Team General Area Review Team (Gen-ART) (genart)
Deadline 2013-05-14
Requested 2013-04-17
Authors Bing Liu , Brian E. Carpenter , Sheng Jiang , Stig Venaas , Wesley George
I-D last updated 2013-05-10
Completed reviews Genart Last Call review of -05 by Robert Sparks (diff)
Genart Telechat review of -07 by Robert Sparks (diff)
Assignment Reviewer Robert Sparks
State Completed
Request Telechat review on draft-ietf-6renum-gap-analysis by General Area Review Team (Gen-ART) Assigned
Reviewed revision 07 (document currently at 08)
Result Ready
Completed 2013-05-10
Thanks Bing -

The updates make the document better, and I appreciate the resolution of

referencing Tim's expired draft.

I think you've addressed all my comments except for the one on section

5.1, but that's ok.

For completeness and ease on the ADs, here's an updated summary:

Document: draft-ietf-6renum-gap-analysis-05.txt
Reviewer: Robert Sparks
Review Date: May 10, 2013
IETF LC End Date: April 10, 2013
IESG Telechat date: May 16, 2013

Summary: Ready

On 5/2/13 6:02 AM, Liubing (Leo) wrote:

Hi, Robert

Thanks a lot for your continuous careful review.
Please see replies inline.

-----Original Message-----
From: Robert Sparks [


Sent: Wednesday, May 01, 2013 12:33 AM
To: renum at; draft-ietf-6renum-gap-analysis at
Cc: gen-art at; ietf at
Subject: Gen-art telechat review: draft-ietf-6renum-gap-analysis-06.txt

I am the assigned Gen-ART reviewer for this draft. For background on
Gen-ART, please see the FAQ at

Please wait for direction from your document shepherd
or AD before posting a new version of the draft.

Document: draft-ietf-6renum-gap-analysis-05.txt
Reviewer: Robert Sparks
Review Date: April 1, 2013
IETF LC End Date: April 10, 2013
IESG Telechat date: May 16, 2013

Summary: Ready with nits (that border on minor issues)

This update improved the readability significantly, and addressed my
major concern about being able to build a list of the gaps. Thank you.

There are a few issues from my last call review that are still not
I have left the classification of minor issue vs nits the same as the
original review to make referring to the earlier review easier,
but please consider all of these Nits. The IESG will need to decide
whether to escalate them.

I've trimmed away the points that were addressed.

On 4/1/13 3:46 PM, Robert Sparks wrote:

Minor issues:

The document currently references
draft-chown-v6ops-renumber-thinkabout several times.
That document is long expired (2006). It would be better to simply
restate what is
important from that document here and reference it only once in the
rather than send the reader off to read it.

This version still references that long expired draft. There was also
conversation on apps-discuss
about making that reference normative. IMHO, this is not the right way
to treat the RFC series, and
strongly encourage moving the text that you want to reference into
something that will
become an RFC.

[Bing] Maybe Brian's suggestion of putting some texts into an appendix is a
good way. We'll discuss this problem when make the next time update.

Should section 8 belong to some other document? It looks like
operational renumbering
advice/considerations, but doesn't seem to be exploring renumbering
gaps, except for
the very short section 8.2 which says "we need a better mechanism"
without much explanation.

Afaict, this wasn't addressed at all. In particular, "we need a better
mechanism" is still all that
section 8.2 says.

[Bing] Sorry for leaving it out. Will do in next update.

Section 5.1, first bullet. The list below "the impact of ambiguous M/O
flags" says things like
"there is no standard" and "it is unspecified". I think you are trying
to say that there is
ambiguity in what's written, not that nothing's written. This entire
list would benefit from
being recast in terms of what needs to be done (what are the gaps?).

This text remains unmodified.

[Bing] We made revision focusing on explaining "what are the gaps", but the
texts change was omitted, will do in next update.

Nits/editorial comments:

There are a few sentences ending with "etc." in the document. Please
consider deleting the
word from the list - it doesn't help each sentence make its point.

There were some changes, but mostly these still exist. I'll leave
pressing this point further to the RFC Editor.

[Bing] A professional language/editorial check would be helpful.

Seciton 7.1: The first bullet does not parse. If I guess its meaning
(that it would be benificial to tell hosts that local DNS has been
updated and
they may want to make fresh queries), please be careful with the
wording. The
hosts don't know which names are likely to resolve locally.

This text remained unchanged, and when coming back to the document for a
(which is somewhat like coming back to an RFC you've read before just
for reference),
it's even harder to understand what it's trying to say than it was when
reading the document

I think you are trying to say
"A notification mechanism may be needed to indicate _to_ hosts that a
renumbering event has _changed how local recursive DNS servers will
respond_. That mechanism may also need to indicate that such a change
will happen at a specific time in the future."

[Bing] I think it's a better description. Will update, thanks much.

Section 7.1, third bullet - This isn't obviously about notification.
Why is it
in this section? What's the gap this is trying to identify?

This text was unchanged.

[Bing] For example, if border routers enabled egress filtering based on the
SIP, then the router need to know the renumbering events on some internal
nodes. We'll make it clear in the next version.

Section 9.4 - what is it about these that make them gaps, much less
unsolvable gaps.
Is this discussion in the wrong section of the document?

This is now section 10.3 and is mostly unchanged. It's still not clear
why this discussion is in the "unsolvable gaps" section.

[Bing] We considered the two points (ID/Locator overloading in transport layer
& address caching in app layer ) are too fundamental that might not be proper
to modify them just in terms of renumbering.

Best regards,