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Re: [tcpm] [multipathtcp] Fwd: Probing the viability of TCP extensions

Fred Baker <fred@cisco.com> Tue, 29 June 2010 18:31 UTC

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From: Fred Baker <fred@cisco.com>
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Cc: Multipath TCP Mailing List <multipathtcp@ietf.org>, tcpm@ietf.org, Hannes Tschofenig <hannes.tschofenig@nsn.com>
Subject: Re: [tcpm] [multipathtcp] Fwd: Probing the viability of TCP extensions
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how many routers does it show that had ECN marking configured active?

On Jun 28, 2010, at 8:31 AM, Patrick McManus wrote:

> On Wed, 2010-06-23 at 00:13 +0100, Scheffenegger, Richard wrote:
> 
>> I am curious, out of the 1,07% of Hosts where ECN negotiation was
>> successful, is there any indication that internet routers are actually
>> making use of the ECT / CE codepoints in the IP header?
>> 
> 
> I have a blog post from 2007 on a different, much smaller, data set:
> 
> http://bitsup.blogspot.com/2007/08/lamenting-ecn-deployments.html
> 
> Basically, it looks at a small sample of 41K flows from my home network
> and sees 8% of them negotiated ECN end to end (which certainly skews
> high), but doesn't see a single instance of a packet being marked by a
> router.
> 
> just one data point.
> 
> 
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