From: Mart Frauenlob <mart.frauenlob@chello.at>
To: netfilter@vger.kernel.org
Subject: Re: how to harden iptables rules?
Date: Thu, 04 Mar 2010 13:34:52 +0100 [thread overview]
Message-ID: <4B8FA8EC.3020100@chello.at> (raw)
In-Reply-To: <4B8E9F4A.9080706@plouf.fr.eu.org>
On 03.03.2010 18:41, Pascal Hambourg wrote:
> Christoph Anton Mitterer a écrit :
>> if I block it completely (except echo-request) I also dont't get any
>> ICMP error messages,
>
> No, valid ICMP error messages have the ESTABLISHED state.
http://www.frozentux.net/iptables-tutorial/iptables-tutorial.html#ICMPCONNECTIONS
and the man page say different.
They don't talk about an icmp error message as a reply to a icmp
message, but just guessing, where's the differenece? why should
netfilter suddenly switch to ESTABLISHED for a icmp error reply?
Best regards
Mart
next prev parent reply other threads:[~2010-03-04 12:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-03 16:20 how to harden iptables rules? Christoph Anton Mitterer
2010-03-03 17:41 ` Pascal Hambourg
2010-03-04 11:47 ` Christoph Anton Mitterer
2010-03-05 0:00 ` Pascal Hambourg
2010-03-05 2:48 ` IP-in-IP matching Andrew Kraslavsky
2010-03-04 12:34 ` Mart Frauenlob [this message]
2010-03-04 16:56 ` how to harden iptables rules? Pascal Hambourg
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