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From: "Brian Carrig" <CARRIGB@ITCARLOW.IE>
To: lartc@vger.kernel.org
Subject: [LARTC] Difficulties with filtering based on TOS byte
Date: Thu, 24 Jun 2004 09:24:21 +0000	[thread overview]
Message-ID: <40DAABD4.28300.4C38B@localhost> (raw)

Hi all,

I want to setup link sharing with a filter that places traffic into different queues based 
on values within the TOS byte. Strangely I can't get this to work. I use the following 
command for the filter:

tc filter add dev eth0 parent 1:0 protocol ip prio 1 u32 match ip tos 0x10 0xff flowid 
1:10

I then mark the packets on the user machine using the 'mangle' table in iptables. I 
have captured the packets on the wire, examined them and the tos field is set 
correctly. Yet it is ignored on my router and packets are sent to the default queue. 

As a test I changed the filter to place packets marked with a tos byte of 0x00 to flowid 
1:10 and despite the packets being marked as minimum delay (0x10) they were now 
sent to the correct queue. No problems are presented when I place packets into 
different queues based on a source address or a port number.

Has anyone else experiences problems like this or know what might be causing it? 
Its very frustrating.

Thanks in advance.

Regards
-- 
Brian Carrig
Department of Computing & Networking
Institute of Technology, Carlow
Tel. No.: +353 59 9176209


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                 reply	other threads:[~2004-06-24  9:24 UTC|newest]

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