From: Jurijs Dorofejevs <jurijs.dorofejevs@ab.lv>
To: lartc@vger.kernel.org
Subject: [LARTC] U32 port masks
Date: Tue, 27 May 2003 09:49:05 +0000 [thread overview]
Message-ID: <marc-lartc-105402928423083@msgid-missing> (raw)
In-Reply-To: <marc-lartc-105405581322185@msgid-missing>
Hi!
Can anybody explain me how does the mask work in filters?
This example set filter for exactly port #2000 :
tc filter add dev eth1 parent 1:0 protocol ip prio 100 u32 match ip sport 2000
0xffff classid 1:256
But if I need to set filter for the range of ports, for example, ports
from 2000 till 3000, what mask do I need?
Trying google, I've read that Mask = 0xffff - (high_port - low_port),
that in my case will be: Mask = 0xffff - (3000 - 2000) = 0xfc17
tc filter add dev eth1 parent 1:0 protocol ip prio 100 u32 match ip sport 2000
0xfc17 classid 1:256
But this example doesn't work correctly and I suppose that I'm wrong
with mask defying algorithm.
Any ideas?
Hope for your help!
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prev parent reply other threads:[~2003-05-27 9:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-27 2:14 [LARTC] U32 port masks Stef Coene
2003-05-27 9:49 ` Jurijs Dorofejevs [this message]
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