Yes and my understanding with ECMP on the network side is that this is exactly 
what’s happening … and that’s what Cloudflare blog entry is referring to as 
well …

I need to dig into this further - their code on Github for the fix I don’t 
believe will work in our network architecture…  although we are thinking of a 
redesign on that area so now would be a great chance to fix this too :)

> On Oct 14, 2016, at 8:17 AM, Mikael Abrahamsson <> wrote:
> On Fri, 14 Oct 2016, JORDI PALET MARTINEZ wrote:
>> Up to now, every time I’ve seen this problem was just related to ICMPv6 
>> being filtered, as many folks do in IPv4 …
> I know several cases where the problem was that the load balancer didn't 
> forward the ICMPv6 PTB to the correct host and didn't handle it itself. No 
> filtering, just bad vendor implementation or "oh, didn't think of that".
> That's why I don't like people using the word "filtering", because this not 
> working isn't always intentional. "Filtering" implies intent.
> -- 
> Mikael Abrahamsson    email:

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