Linux Netfilter discussions
 help / color / mirror / Atom feed
From: Pascal Hambourg <pascal.mail@plouf.fr.eu.org>
To: Jan Engelhardt <jengelh@medozas.de>
Cc: "Dennis J." <dennisml@conversis.de>,
	netfilter@vger.kernel.org,
	Mart Frauenlob <mart.frauenlob@chello.at>,
	pablo@netfilter.org
Subject: Re: Synflood filtering and Conntrack
Date: Wed, 28 Jul 2010 15:30:18 +0200	[thread overview]
Message-ID: <4C5030EA.90600@plouf.fr.eu.org> (raw)
In-Reply-To: <alpine.LSU.2.01.1007280756510.26636@obet.zrqbmnf.qr>

Hello,

Jan Engelhardt a écrit :
> On Wednesday 2010-07-28 07:24, Mart Frauenlob wrote:
>> 
>> afaik, the (according) ct entries are destroyed on DROP.
> 
> They are not destroyed on DROP, and you can easily check that.

Right, the DROP target has no direct effect on conntrack. When a packet
belonging to an already existing (confirmed) connection is dropped, the
conntrack entry is not destroyed. But IIUC when the first packet that
would create a new connection (and a new conntrack entry) is dropped for
any reason before it reaches the conntrack confirm in the LOCAL_IN or
POST_ROUTING hooks (after INPUT or POSTROUTING chains), the conntrack
entry is destroyed, isn't it ? I guess that is what Mart meant.



  reply	other threads:[~2010-07-28 13:30 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-27 22:29 Synflood filtering and Conntrack Dennis J.
2010-07-28  5:24 ` Mart Frauenlob
2010-07-28  6:11   ` Jan Engelhardt
2010-07-28 13:30     ` Pascal Hambourg [this message]
2010-07-28 14:10       ` Jan Engelhardt
2010-07-28 14:27         ` Pascal Hambourg
2010-07-29 11:11     ` Mart Frauenlob
2010-07-29 11:21       ` Jan Engelhardt
2010-07-29 11:31         ` Mart Frauenlob
2010-07-29 12:34           ` Pascal Hambourg
2010-07-29 12:49             ` Jan Engelhardt
2010-07-29 13:16               ` Pascal Hambourg
2010-07-29 15:50               ` Jozsef Kadlecsik
2010-07-29 17:14                 ` Gáspár Lajos
2010-07-29 17:52                   ` Jozsef Kadlecsik
2010-07-29 22:18                 ` Mart Frauenlob
2010-07-29 23:19                 ` Pascal Hambourg
2010-07-30 10:32                   ` Jozsef Kadlecsik

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4C5030EA.90600@plouf.fr.eu.org \
    --to=pascal.mail@plouf.fr.eu.org \
    --cc=dennisml@conversis.de \
    --cc=jengelh@medozas.de \
    --cc=mart.frauenlob@chello.at \
    --cc=netfilter@vger.kernel.org \
    --cc=pablo@netfilter.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox