Re: [aqm] Updated draft-ietf-aqm-ecn-benefits - comments still welcome

Dave Taht <> Wed, 18 March 2015 17:45 UTC

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Date: Wed, 18 Mar 2015 10:45:31 -0700
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From: Dave Taht <>
To: Gorry Fairhurst <>
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Subject: Re: [aqm] Updated draft-ietf-aqm-ecn-benefits - comments still welcome
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section 6 addition. (could use more verbiage)

6.3 "An AQM that is ECN aware MUST have overload protection.

It is trivial for a malbehaved application/worm/bot to mark all it's
packets with ECN and thus gain priority over other traffic not ecn marked.

6.4  Enabling ECN at the application layer requires access to the IP header
fields, which are usually
       abstracted out completely at the tcp layer, and hard to access from
udp with multiple non-portable
       methods to do so. ECN over UDP in new applications such as webrtc
and Quic has great potential for
       many other applications, however the same care of design that went
into ECN on TCP needs to go
       into future UDP based protocols.

Some other section that may end up here?

ECN marking other sorts of flows (example routing packets) that have a
higher priority than other flows on link-local packets may be of benefit
with wider availability of aqm technologies that are ecn aware...

On Wed, Mar 18, 2015 at 8:49 AM, <> wrote:

> Chairs, WG,
> Thanks for all people who emailed me on and off list.
> Apologies to be editing when we supposed to be in reading mode prior to
> the IETF (!!). However, since this seems to me to be useful, I continue.
> I have updated the "unpublished" current version - this is ready for
> upload (including minor corrections):
> Since some people have already shown an interest in Wes's proposal to
> restructure the thinking on deployment pitfalls, I've also started a
> second new version that rolls all the previous corrections together and
> also starts to apply this change. This version is still being updated, and
> is here:
> If you wish to add comments - please do send. I still plan to roll more
> corrections into rev -02, and then upload both revisions as soon as the ID
> archives open again.
> Best wishes,
> Gorry (& MIchael)
> _______________________________________________
> aqm mailing list

Dave Täht
Let's make wifi fast, less jittery and reliable again!