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Date:	Fri, 04 May 2012 11:09:31 -0700
From:	Rick Jones <>
To:	Eric Dumazet <>
CC:	David Miller <>,
	netdev <>,
	Perry Lorier <>,
	Matt Mathis <>,
	Yuchung Cheng <>,
	Neal Cardwell <>,
	Tom Herbert <>,
	Wilmer van der Gaast <>,
	Dave Täht <>,
	Ankur Jain <>
Subject: Re: [PATCH net-next] tcp: be more strict before accepting ECN negociation

On 05/04/2012 08:14 AM, Eric Dumazet wrote:
> From: Eric Dumazet<>
> It appears some networks play bad games with the two bits reserved for
> ECN. This can trigger false congestion notifications and very slow
> transferts.
> Since RFC 3168 (6.1.1) forbids SYN packets to carry CT bits, we can
> disable TCP ECN negociation if it happens we receive mangled CT bits in
> the SYN packet.

What sort of networks were these?  Any chance it was some sort of 
attempt to add ECN to FastOpen?

rick jones

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