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Message-ID: <CADVnQy=ShWzLOMOhCV5=Me9P4QSCkHK0RQciLXME30B=JWaZkQ@mail.gmail.com> Date: Fri, 4 May 2012 11:54:09 -0400 From: Neal Cardwell <ncardwell@...gle.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>, 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 Fri, May 4, 2012 at 11:14 AM, Eric Dumazet <eric.dumazet@...il.com> 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. > > Signed-off-by: Eric Dumazet <edumazet@...gle.com> > Cc: Perry Lorier <perryl@...gle.com> > Cc: Matt Mathis <mattmathis@...gle.com> > Cc: Yuchung Cheng <ycheng@...gle.com> > Cc: Neal Cardwell <ncardwell@...gle.com> > Cc: Wilmer van der Gaast <wilmer@...gle.com> > Cc: Ankur Jain <jankur@...gle.com> > Cc: Tom Herbert <therbert@...gle.com> > Cc: Dave Täht <dave.taht@...ferbloat.net> > --- > include/net/tcp.h | 23 ++++++++++++++++------- > net/ipv4/tcp_ipv4.c | 2 +- > net/ipv6/tcp_ipv6.c | 2 +- > 3 files changed, 18 insertions(+), 9 deletions(-) Acked-by: Neal Cardwell <ncardwell@...gle.com> neal -- 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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