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List: linux-vortex
Subject: Re: [vortex] 3Com Corporation 3c905C-TX/TX-M [Tornado] initializes
From: Donald Becker <becker () scyld ! com>
Date: 2003-09-29 22:32:03
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On Mon, 29 Sep 2003, Tobias Poppe wrote:
> It seems as if the chip of the 3Com Corporation 3c905C-TX/TX-M
> [Tornado] (driver 3x59x.o) by default initializes with promisch mode.
> (The chip itself. The PROMISC flag is not shown in the ifconfig <dev>
> output).
>
> I send arp-request packets with a destination mac of ff:ff:ff:ff:ff:fe
Uhmmm, that's a multicast address. Most of the 3Com chips either do not
have a hardware multicast filter, or have one that is unusable. So the
driver puts the chips into Rx-all-multicast mode, or only adds (never
deletes) multicast filter channels.
Try the same test with a non-multicast address.
An easy way to run this test is with the ether-wake program.
ftp://ftp.scyld.com/pub/diag/
It will send to arbitrary destination addresses, including multicast
addresses. I use this program in the driver validation scripts rather
than maintain a unique program to generate packets.
--
Donald Becker becker@scyld.com
Scyld Computing Corporation http://www.scyld.com
914 Bay Ridge Road, Suite 220 Scyld Beowulf cluster system
Annapolis MD 21403 410-990-9993
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