netdev - Re: [PATCH -next 0/2] net: allow setting ecn via routing table

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Message-ID: <20141030231637.GF10069@breakpoint.cc>
Date:	Fri, 31 Oct 2014 00:16:37 +0100
From:	Florian Westphal <fw@...len.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Florian Westphal <fw@...len.de>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH -next 0/2] net: allow setting ecn via routing table

Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Thu, 2014-10-30 at 23:15 +0100, Florian Westphal wrote:
> 
> > Do you think a fallback to non-ecn for retransmitted syns would help?
> 
> Unfortunately some firewalls are buggy and accept a single SYN per flow.
[..]
> Note that ECN problems are not only contained in SYN packets being
> eventually dropped. You might have a success to establish a flow, and
> later get CE marks for all packets and cwnd converges to 1.

I see. So that makes ecn=1 default a pure fantasy.

Thanks for explaining this.
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