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Message-ID: <CAA93jw755V9kJ=P1gFsG2oafddhsebzfT3DuY5NX59GPpheOZg@mail.gmail.com> Date: Fri, 1 Jun 2012 18:28:17 -0700 From: Dave Taht <dave.taht@...il.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: Hans Schillstrom <hans.schillstrom@...csson.com>, netdev <netdev@...r.kernel.org>, Neal Cardwell <ncardwell@...gle.com>, Tom Herbert <therbert@...gle.com>, Jesper Dangaard Brouer <brouer@...hat.com> Subject: Re: [PATCH net-next] tcp: avoid tx starvation by SYNACK packets On Thu, May 31, 2012 at 2:56 PM, Eric Dumazet <eric.dumazet@...il.com> wrote: > From: Eric Dumazet <edumazet@...gle.com> > > pfifo_fast being the default Qdisc, its pretty easy to fill it with > SYNACK (small) packets while host is under SYNFLOOD attack. > > Packets of established TCP sessions are dropped and host appears almost > dead. > > Avoid this problem assigning TC_PRIO_FILLER priority to SYNACK > generated in SYNCOOKIE mode, so that these packets are enqueued into > pfifo_fast band 2. > > Other packets, queued to band 0 or 1 are dequeued before any SYNACK > packets waiting in band 2. I am curious as to how well fq_codel survives an attack like this, without aid. -- 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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