From mboxrd@z Thu Jan  1 00:00:00 1970
From: gypsy <gypsy@iswest.com>
Date: Sun, 21 Nov 2004 06:09:55 +0000
Subject: [LARTC] tc is broken for "protocol arp" filters
Message-Id: <41A03133.88697C06@iswest.com>
List-Id: <lartc.vger.kernel.org>
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To: lartc@vger.kernel.org

I have tested Devik's tc (103592 bytes) and 2.6.8 which I compiled. 
Both return "RTNETLINK answers: Invalid argument".  

Stephen Hemminger should be sent a patch that fixes this.

An example that returns the above error message is:
tc filter add dev eth1 parent 1: protocol arp prio 5 u32 \
   match u16 0x0806 0xffff at -2 flowid 1:50

I'm using this because it works:
# Example that matches ARP (a big "thank you" to Martin Brown for
this!):
# dst MAC is 6 bytes at -14
# src MAC is 6 bytes at -8
# the ARP protocol is 2 bytes at -2
# the "0806" comes from linux/include/linux/if_ether.h
tc filter add dev eth1 parent 1: protocol ip prio 5 u32 \
   match u16 0x0806 0xffff at -2 flowid 1:50

gypsy
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