netdev - Re: libpcap and tc filters

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Message-ID: <CAA0qwj70-qUQ+6NL=2LP05TyMN99MdL1BF8tko+v=DhdyjZjJQ@mail.gmail.com>
Date:	Mon, 4 Jul 2011 15:01:34 +0300
From:	Adam Katz <adamkatz0@...il.com>
To:	jhs@...atatu.com
Cc:	netdev@...r.kernel.org
Subject: Re: libpcap and tc filters

Ok, I just tried this:

I've opened www.example.com using a browser while capturing with
wireshark. TC placed all port 80 packets into the 1:1 as required. I
then physically plugged the nic to a different socket, one that isn't
connected to the internet (i did this so I wont get any server
responses to the packets i'm sending) and then I replayed the capture
of me opening www.example.com

The second time, none of the packets ended up in 1:1 - they all went
to the default class despite being the EXACT same traffic.

On Mon, Jul 4, 2011 at 2:11 PM, jamal <hadi@...erus.ca> wrote:
>
> Capture tcpdump for both scenario that works and one
> that doesnt.
> Make sure the filters match your failing scenario.
>
> cheers,
> jamal
>
> On Mon, 2011-07-04 at 10:38 +0300, Adam Katz wrote:
>> Hi Everyone
>>
>> I'm sorry for littering the mailing list with this question, but no
>> other place could help me..
>>
>> I'm attempting to use tc to shape traffic sent using libpcap, I'm
>> doing this for a research project. I have a classful scheduler with
>> several classes, to this scheduler I attach a few filters based on
>> destination tcp ports.
>>
>> My problem is this: When sending packets using a normal userland
>> socket, the filters work and I see the appropriate traffic entering
>> the right class. BUT when sending packets with libpcap, all packets
>> end up in the scheduler's default band as if the filters simply refuse
>> to work.
>>
>> Can anyone suggest a solution?
>> --
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>
>
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