From mboxrd@z Thu Jan  1 00:00:00 1970
From: GGounot <g.gounot@laposte.net>
Date: Wed, 17 Sep 2014 07:09:58 +0000
Subject: Re: Hook location of IMQ
Message-Id: <541933C6.8070800@laposte.net>
List-Id: <lartc.vger.kernel.org>
References: <3b7201cfd204$1e118300$5a348900$@telsatbb.vu>
In-Reply-To: <3b7201cfd204$1e118300$5a348900$@telsatbb.vu>
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To: lartc@vger.kernel.org

Hi.

Did you try IFB instead of IMQ ?

"The Intermediate Functional Block device is the successor to the IMQ=20
iptables module that was never integrated."
http://www.linuxfoundation.org/collaborate/workgroups/networking/ifb


Le 17/09/2014 01:15, Steve (Telsat Broadband) a =E9crit :
> Hi All,
>
> I've posted a couple of questions over on linuximq.net but the discussion
> there seems quiet, so I'll try here to see if anyone here can point me in
> the right direction.
>
> Currently I use IMQ devices and TC to limit bandwidth to clients; this is
> all working very well, except that the byte counters I'm relying on for
> counting the clients data seems to be 'before' IMQ does its work.
>
> For example; I've got rules in the 'mangle/forward' table for assigning t=
he
> clients data to the IMQ device and rules in the 'filter/forward' table wh=
ich
> matches the client's data and I'm counting their traffic from here.
>
> However, according to this packet flow show on linuximq.net
> (http://www.docum.org/docum.org/kptd/) the IMQ hook is after 'POSTROUTING'
> which means that even though I'm using '-j IMQ' in the 'mangle/forward'
> table to limit the bandwidth before counting; the counters are still
> counting all packets; including dropped ones by IMQ.
>
> There doesn't seem to be any more 'chains' after the IMQ hook which I cou=
ld
> rely upon to 'count' the data after IMQ has done its job.
>
> I realise that when compiling the kernel, I can choose where IMQ hooks in
> (before or after NAT); currently I have selected as 'AB'.
>
> What I'd like to know is;
>
> a) Is there something I'm missing; is there somewhere I can count the
> packets after IMQ's work is done?
> b) If not, is there some way I can modify the IMQ hook to be in-between t=
he
> 'mangle/forward' and 'filter/forward' chains.
>
> Any help/comments are greatly appreciated.
>
> Thanks
> Steve.
>
>
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