[Ecn-sane] osx not doing ecn for me

[Dave Taht]

Going back to looking at this my devices... my mac rarely attempts ecn
over ipv4 or ipv6 nowadays. It seems to fall back to not even trying,
frequently. So for example on one rrul test on a local AP, it will
successfuly try for all the connection, but on a subsequent test won't
try at all or only try two or so. I sat down to look at it harder with
the rrul test against various servers, today....

There is a complex heuristic at work here that I do not understand.
It's really hard to do science when you can't force it to always
negotiate, but I guess it explains
some of the complex data I have from the field where the attempts do
not match the size of the deployment in any sane way.

This is osx high sierra 10.13.6.

On Fri, Jan 10, 2020 at 1:41 AM Pete Heist <pete at heistp.net> wrote:
>
>
> > On Jan 10, 2020, at 9:48 AM, Michael Welzl <michawe at ifi.uio.no> wrote:
> >
> >> On Jan 10, 2020, at 12:45 AM, Dave Taht <dave.taht at gmail.com> wrote:
> >>
> >> On Thu, Jan 9, 2020 at 3:30 PM Pete Heist <pete at heistp.net> wrote:
> >>>
> >>> Mine negotiates it, but I’m stuck on 10.13.
> >>>
> >>> This likely isn’t the problem, but I’ve fallen for the trap before that “netstat -sp tcp” needs to be run as root or all counters show 0...
> >>
> >> No, that was the trap I'd fallen for. I'd seen it not attempt a couple
> >> negotiations (from looking at the packet captures), then ran that, and
> >> panicked!
> >
> > … and I thought that your Mac had discovered that you hate ECN and turned it off just for you  :)
>
> I’d started on some other good conspiracy theories when it didn’t work for me but Jon set me straight. :)
>


-- 
Make Music, Not War

Dave Täht
CTO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-831-435-0729