From: Sebastian Moeller <moeller0@gmx.de>
To: Pete Heist <pete@heistp.net>
Cc: "Dave Täht" <dave.taht@gmail.com>,
ECN-Sane <ecn-sane@lists.bufferbloat.net>
Subject: Re: [Ecn-sane] mosh ecn bits washed out
Date: Fri, 19 Mar 2021 09:56:22 +0100 [thread overview]
Message-ID: <42F85394-FF4B-48BF-89B1-082D97CFA76C@gmx.de> (raw)
In-Reply-To: <bc033e58bb1457d93a1dc66b197671faf6855b6f.camel@heistp.net>
Hi Pete,
> On Mar 19, 2021, at 09:25, Pete Heist <pete@heistp.net> wrote:
>
> Meaning, the negotiation succeeds and ECT(0) is set going up, but
> zeroed on packets by the time they come down?
>
> The negotiation can also be blocked with iptables --ecn-tcp-remove,
> which just zeroes out ECE and CWR, preventing negotiation
> (https://git.netfilter.org/iptables/tree/extensions/libipt_ECN.c), but
> I doubt that's very commonly done.
Oh, that looks interesting, probably not too hard to extend this to also allow to selectively only re-map ECT(1) and or ECT(0). I wonder what TCP Prague would do if its ECT(1) flows are switched to ECT(0) in transit?
Best Regards
Sebastian
>
> On Thu, 2021-03-18 at 13:00 -0700, Dave Taht wrote:
>> mosh, which has long had excellent support for ecn, appears to be
>> getting the
>> ecn bit washed out along my path from california to england.
>>
>> ecn survives up that way, but not down.
>>
>> Just a single data point thus far.
>>
>
>
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next prev parent reply other threads:[~2021-03-19 8:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-18 20:00 Dave Taht
2021-03-19 8:25 ` Pete Heist
2021-03-19 8:56 ` Sebastian Moeller [this message]
2021-03-19 9:18 ` [Ecn-sane] re-marking ECT(1) to ECT(0) (was: mosh ecn bits washed out) Pete Heist
2021-03-19 14:24 ` Sebastian Moeller
2021-03-19 14:08 ` [Ecn-sane] mosh ecn bits washed out Dave Taht
2021-03-19 14:59 ` Pete Heist
2021-03-19 15:26 ` Dave Taht
2021-03-20 5:24 ` Mikael Abrahamsson
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