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Date:	Fri, 04 May 2012 11:48:49 -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 11:23 AM, Eric Dumazet wrote:
> On Fri, 2012-05-04 at 11:09 -0700, Rick Jones wrote:
>> What sort of networks were these?  Any chance it was some sort of
>> attempt to add ECN to FastOpen?
> Nothing to do with fastopen.
> Just take a look at a random http server and sample all SYN packets it
> receives.
> Some of them have TOS bits 0 or 1 set, or even both bits set.

I'll fire-up tcpdump on

tcpdump -i eth0 -vvv '(tcp[tcpflags] & tcp-syn != 0) && (ip[1] != 0x0)'

and see what appears.

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