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ECN

Subject: ECN
From: nanog at as397444.net (Matt Corallo)
Date: Wed, 13 Nov 2019 12:00:25 -0500
In-reply-to: <[email protected]>
References: <[email protected]>

Not ideal, sure, but if itâ??s only for the SYN (as you seem to indicate), splitting the flow shouldnâ??t have material performance degradation? 

> On Nov 13, 2019, at 11:51, Toke HÃ¸iland-JÃ¸rgensen <toke at toke.dk> wrote:
> 
> ï»¿
> 
>> On 13 November 2019 17:20:18 CET, Matt Corallo <netadmin at as397444.net> wrote:
>> This sounds like a bug on Cloudflareâ??s end (cause trying to do anycast
>> TCP is... out of spec to say the least), not a bug in ECN/ECMP.
> 
> Even without anycast, an ECMP shouldn't hash on the ECN bits. Doing so will split the flow over multiple paths; avoiding that is the whole point of doing the flow-based hashing in the first place.
> 
> Anycast "only" turns a potential degradation of TCP performance into a hard failure... :)
> 
> -Toke

Follow-Ups:
- ECN
  - From: anoop at alumni.duke.edu (Anoop Ghanwani)
- ECN
  - From: jlewis at lewis.org (Jon Lewis)

References:
- ECN
  - From: toke at toke.dk (Toke Høiland-Jørgensen)

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