netdev - Re: atl1e Ethernet driver not seeing packets sent to 33:33:00:00:00:01 multicast

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Date:	Tue, 11 Nov 2008 08:06:11 -0600
From:	"J. K. Cliburn" <jcliburn@...il.com>
To:	David Madore <david.madore@....fr>
Cc:	Linux Kernel Mailing-List <linux-kernel@...r.kernel.org>,
	Linux NetDev Mailing-List <netdev@...r.kernel.org>,
	atl1-devel@...ts.sourceforge.net
Subject: Re: atl1e Ethernet driver not seeing packets sent to
 33:33:00:00:00:01 multicast

On Tue, 11 Nov 2008 14:31:08 +0100
David Madore <david.madore@....fr> wrote:

> Hi,
> 
> This is on Ubuntu 8.10 "Intrepid Ibex" using its stock kernel
> (2.6.27-7.16), with an Eee PC 901 whose Ethernet adapter is (according
> to lspci):
> 
> 04:00.0 Ethernet controller: Attansic Technology Corp. L1 Gigabit
> Ethernet Adapter (rev b0)

Just to verify your system is fitted with the L1e and not the L1 chip,
can you please provide the output of lspci -vvnn?

> 
> using driver atl1e of said kernel.
> 
> _Unless_ the network device is put in promiscuous mode (e.g., by
> running tcpdump), it does not see packets sent to Ethernet multicast
> address 33:33:00:00:00:01.  E.g., IPv6 packets to ff02::1
> (ip6-allnodes) are not seen.
> 
> Practical consequence: IPv6 is broken, because router advertisements
> are not received.
> 
> ("ip maddr show" does give "link  33:33:00:00:00:01" among the
> subscribed multicast addresses, so it's not a config problem.)
> 
> Is this a known problem?  Is there a patch fixing it?
> 
> Until then, a workaround is to put the device in promiscuous mode.
> 
> Happy hacking,
> 
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