From: Nils Rennebarth <nils.rennebarth@funkwerk-ec.com>
To: "Humberto Jucá" <betolj@gmail.com>
Cc: "netfilter@vger.kernel.org" <netfilter@vger.kernel.org>
Subject: Re: REJECT target faster for remote than for local packets?
Date: Tue, 27 Mar 2012 19:45:15 +0200 [thread overview]
Message-ID: <4F71FCAB.9090208@funkwerk-ec.com> (raw)
In-Reply-To: <CACuyg24vONpi0OSGMsc7MyiZJ_R+fr28KhkYrpBF1fmNKz=XoQ@mail.gmail.com>
On 27.03.2012 19:21, Humberto Jucá wrote:
> Hi,
>
>> iptables -I OUTPUT --protocol tcp --dport 80 -j REJECT
> For TCP connections, try to do with "-j REJECT --reject-with tcp-reset".
> Its faster then port unreachable!
Makes no difference here. Takes 3 seconds, exactly the time to the next
SYN packet.
Oh well, that is true for the 2.6.32 kernel. But for the 3.2.0 kernel,
it really does make a difference:
with --reject-with icmp-port-unreachable it takes only 1 second
and with --reject-with tcp-reset the reaction is instantaneous
(i.e. 32ms)
What exactly did change in the kernel and when?
--
Mit freundlichen Grüßen / with kind regards
Nils Rennebarth, Software Developer
prev parent reply other threads:[~2012-03-27 17:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-27 13:51 REJECT target faster for remote than for local packets? Nils Rennebarth
2012-03-27 17:21 ` Humberto Jucá
2012-03-27 17:45 ` Nils Rennebarth [this message]
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