From: Jarek Poplawski <jarkao2@gmail.com>
To: Krzysztof Oledzki <olel@ans.pl>
Cc: Denys Fedoryshchenko <denys@visp.net.lb>, netdev@vger.kernel.org
Subject: Re: DoS by cat /proc/net/ip_conntrack ?
Date: Sat, 08 Mar 2008 13:26:41 +0100 [thread overview]
Message-ID: <47D28601.4080106@gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0803061449220.23263@bizon.gios.gov.pl>
Krzysztof Oledzki wrote, On 03/06/2008 02:51 PM:
>
> On Thu, 6 Mar 2008, Denys Fedoryshchenko wrote:
...
>> i tried to issue command cat /proc/net/ip_conntrack |grep 'something'
>>
>> Router went dead for about 2 minutes, even i disconnect ssh session.
...
>> I dont think it is normal, and such command taking a lot of system resources
>> and cause whole system to hang.
>>
>> Kernel 2.6.24.2
>
> The answer is quite simple here: don't do this. Instead use "conntrack -L"
> as netlink is much more effective and better designed.
I think, Denys is concerned about some other, maybe too curious users
if they can read this?
Regards,
Jarek P.
next prev parent reply other threads:[~2008-03-08 12:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-06 13:43 DoS by cat /proc/net/ip_conntrack ? Denys Fedoryshchenko
2008-03-06 13:51 ` Krzysztof Oledzki
2008-03-08 12:26 ` Jarek Poplawski [this message]
2008-03-08 12:33 ` Jarek Poplawski
2008-03-08 14:24 ` Denys Fedoryshchenko
2008-03-08 14:44 ` Jarek Poplawski
2008-03-08 15:18 ` Patrick McHardy
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