[Ecn-sane] Meanwhile, over on NANOG...

[Rich Brown]

I saw this message crop up in the NANOG digest today... https://mailman.nanog.org/pipermail/nanog/2019-November/104045.html

Rich

> Message: 9
> Date: Mon, 11 Nov 2019 16:55:14 -0800
> From: Owen DeLong <owen at delong.com>
> To: Baldur Norddahl <baldur.norddahl at gmail.com>
> Cc: nanog at nanog.org
> Subject: Re: ECN
> Message-ID: <59956815-A2BB-4DA3-AD57-C746C49FD617 at delong.com>
> Content-Type: text/plain;	charset=utf-8
> 
> 
> 
>> On Nov 11, 2019, at 05:01 , Baldur Norddahl <baldur.norddahl at gmail.com> wrote:
>> 
>> Hello
>> 
>> I have a customer that believes my network has a ECN problem. We do not, we just move packets. But how do I prove it?
> 
> Are you saying that none of your routers support ECN or that you think ECN only applies to endpoints?
> 
>> Is there a tool that checks for ECN trouble? Ideally something I could run on the NLNOG Ring network.
>> 
>> I believe it likely that it is the destination that has the problem.
> 
> I’d say start with asking the reporter to provide a PCAP of the problem and review the packet trace to provide clues of tap points
> in your network to investigate where ECN is (or should be) occurring and the opposite is occurring.
> 
> Owen
>