From: Alessandro Vesely <vesely@tana.it>
To: netfilter@vger.kernel.org
Cc: support@iptables.info
Subject: Re: Best way to kill a live TCP connection?
Date: Tue, 11 Jan 2011 17:21:08 +0100 [thread overview]
Message-ID: <4D2C8374.70408@tana.it> (raw)
In-Reply-To: <alpine.LNX.2.01.1101111537180.8612@obet.zrqbmnf.qr>
On 11/Jan/11 15:41, Jan Engelhardt wrote:
> On Tuesday 2011-01-11 13:35, Alessandro Vesely wrote:
>
>>Hi all,
>>this is clearly an overworked topic. However, I haven't been able to
>>find definitive info about it. Please help providing more insight.
>>In particular, if it is possible/convenient to design an RST injector
>>and how to attach it to iptables?
>
> If you use a ruleset that emits RST for NEW connections that are picked
> up rather than SYN-new,
>
> -m conntrack --ctstate NEW -p tcp ! --syn --dport 22 -j REJECT
> --reject-with tcp-reset
>
> .. makes it possible to RST-kill connections using `conntrack -D`.
That's the most elegant method I've seen thus far. Thanks a lot!
A generic rule like that (i.e. without --dport) is mentioned in the
tutorial http://www.iptables.info/en/iptables-problems.html#NEWNOTSYN
but I never realized it can be used this way. (I CC this there.)
next prev parent reply other threads:[~2011-01-11 16:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-11 12:35 Best way to kill a live TCP connection? Alessandro Vesely
2011-01-11 14:41 ` Jan Engelhardt
2011-01-11 16:21 ` Alessandro Vesely [this message]
2011-01-11 17:39 ` Pascal Hambourg
2011-01-11 21:10 ` Grant Taylor
2011-01-11 22:31 ` Jan Engelhardt
2011-01-12 8:52 ` Alessandro Vesely
2011-01-18 17:50 ` Alessandro Vesely
2011-01-18 18:45 ` Gáspár Lajos
2011-01-19 13:32 ` Alessandro Vesely
2011-01-12 0:20 ` Pablo Neira Ayuso
2011-01-12 0:20 ` Pablo Neira Ayuso
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