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From: Patrick McHardy <kaber@trash.net>
To: Jesper Dangaard Brouer <hawk@diku.dk>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
	Changli Gao <xiaosuo@gmail.com>,
	hawk@comx.dk,
	Linux Kernel Network Hackers <netdev@vger.kernel.org>,
	netfilter-devel@vger.kernel.org,
	Paul E McKenney <paulmck@linux.vnet.ibm.com>
Subject: Re: DDoS attack causing bad effect on conntrack searches
Date: Fri, 23 Apr 2010 15:57:41 +0200	[thread overview]
Message-ID: <4BD1A755.1020201@trash.net> (raw)
In-Reply-To: <Pine.LNX.4.64.1004231440190.840@ask.diku.dk>

Jesper Dangaard Brouer wrote:
> On Fri, 23 Apr 2010, Patrick McHardy wrote:
> 
>> That sounds like a good idea. But lets what for Jesper's test results
>> before we start fixing this problem :)
> 
> I will first have time to perform the tests Monday or Tuesday.
> 
> BUT I have just noticed there seems to be a corrolation between
> conntrack early_drop and searches.  I have upload a new graph:
> 
>  http://people.netfilter.org/hawk/DDoS/2010-04-12__001/conntrack_early_drop002.png

I guess that's somewhat expected when your conntrack table is full
and all you're seeing is new connection setup attempts.

First you have a search for an existing conntrack, then it attempts
to create a new one and tries to early_drop and old one.

  reply	other threads:[~2010-04-23 13:57 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-22 12:58 DDoS attack causing bad effect on conntrack searches Jesper Dangaard Brouer
2010-04-22 13:13 ` Changli Gao
2010-04-22 13:17   ` Patrick McHardy
2010-04-22 14:36     ` Eric Dumazet
2010-04-22 14:53       ` Eric Dumazet
2010-04-22 15:51         ` Paul E. McKenney
2010-04-22 16:02           ` Eric Dumazet
2010-04-22 16:34             ` Paul E. McKenney
2010-04-22 20:38             ` Jesper Dangaard Brouer
2010-04-22 21:03               ` Eric Dumazet
2010-04-22 21:14                 ` Eric Dumazet
2010-04-22 23:44                   ` David Miller
2010-04-23  5:44                     ` Eric Dumazet
2010-04-23  8:13                       ` David Miller
2010-04-23  8:18                         ` David Miller
2010-04-23  8:40                           ` Jesper Dangaard Brouer
2010-04-23 10:36                   ` Patrick McHardy
2010-04-23 11:06                     ` Eric Dumazet
2010-04-22 21:28                 ` Jesper Dangaard Brouer
2010-04-23  7:23                   ` Jan Engelhardt
2010-04-23  7:46                     ` Eric Dumazet
2010-04-23  7:55                       ` Jan Engelhardt
2010-04-23  9:23                         ` Eric Dumazet
2010-04-23 10:55                 ` Patrick McHardy
2010-04-23 11:05                   ` Eric Dumazet
2010-04-23 11:06                     ` Patrick McHardy
2010-04-23 20:57               ` Eric Dumazet
2010-04-24 11:11                 ` Jesper Dangaard Brouer
2010-04-24 20:11                   ` Eric Dumazet
2010-04-26 14:36                     ` Jesper Dangaard Brouer
2010-05-31 21:21                       ` Eric Dumazet
2010-06-01  0:28                         ` Changli Gao
2010-06-01  5:05                           ` Eric Dumazet
2010-06-01  5:48                             ` Changli Gao
2010-06-01 10:18                             ` Patrick McHardy
2010-06-01 10:31                               ` Eric Dumazet
2010-06-01 10:41                                 ` Patrick McHardy
2010-06-01 16:20                                   ` [RFC nf-next-2.6] conntrack: per cpu nf_conntrack_untracked Eric Dumazet
2010-06-04 11:40                                     ` Patrick McHardy
2010-06-04 12:10                                       ` Changli Gao
2010-06-04 12:29                                         ` Patrick McHardy
2010-06-04 12:36                                           ` Eric Dumazet
2010-06-04 16:25                                             ` [PATCH nf-next-2.6] conntrack: IPS_UNTRACKED bit Eric Dumazet
2010-06-04 20:15                                               ` [PATCH nf-next-2.6 2/2] conntrack: per_cpu untracking Eric Dumazet
2010-06-08 14:29                                                 ` Patrick McHardy
2010-06-08 14:52                                                   ` Eric Dumazet
2010-06-08 15:12                                                     ` Eric Dumazet
2010-06-09 12:45                                                       ` Patrick McHardy
2010-06-08 14:12                                               ` [PATCH nf-next-2.6] conntrack: IPS_UNTRACKED bit Patrick McHardy
2010-04-23 10:56       ` DDoS attack causing bad effect on conntrack searches Patrick McHardy
2010-04-23 12:45         ` Jesper Dangaard Brouer
2010-04-23 13:57           ` Patrick McHardy [this message]
2010-04-22 13:31   ` Jesper Dangaard Brouer
2010-04-23 10:35     ` Patrick McHardy

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