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Message-ID: <4FA41B5B.5080103@hp.com> Date: Fri, 04 May 2012 11:09:31 -0700 From: Rick Jones <rick.jones2@...com> To: Eric Dumazet <eric.dumazet@...il.com> CC: David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, Perry Lorier <perryl@...gle.com>, Matt Mathis <mattmathis@...gle.com>, Yuchung Cheng <ycheng@...gle.com>, Neal Cardwell <ncardwell@...gle.com>, Tom Herbert <therbert@...gle.com>, Wilmer van der Gaast <wilmer@...gle.com>, Dave Täht <dave.taht@...ferbloat.net>, Ankur Jain <jankur@...gle.com> 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<edumazet@...gle.com> > > 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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