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Date:	Thu, 30 Oct 2014 16:05:42 -0700
From:	Eric Dumazet <>
To:	Florian Westphal <>
Cc:	David Miller <>,
Subject: Re: [PATCH -next 0/2] net: allow setting ecn via routing table

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?
> If not, do you think having ecn tunable available via route is helpful?

Unfortunately some firewalls are buggy and accept a single SYN per flow.

You would need to blacklist ecn at first sign of a possible ecn problem,
for all following connections attempts.

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.

This is really a lot of work to get all sorted out.

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