Gergely Madarasz wrote:
> On Mon, Jan 10, 2005 at 12:40:57PM -0500, Neil Horman wrote:
>
>>Gergely Madarasz wrote:
>>
>>>On Mon, Jan 10, 2005 at 11:04:55AM -0500, Neil Horman wrote:
>>>
>>>
>>>>Strange. My concern was that the tg3 interface has its hardware reset
>>>>whenever its set to be up, and part of that is a resetting of its
>>>>receive mode. If for some reason IFF_PROMISC was cleared after you set
>>>>it using brctl, the interface might be taken out of promisc mode. Do
>>>>you have any iptables rules running that might drop bpdus?
>>>
>>>
>>>No iptables rules az all. Btw iptables wouldn't prevent tcpdump from
>>>seeing the packets, would it?
>>>Could it be that the driver perhaps has a problem setting promisc mode
>>>when resetting the hardware?
>>>
>>
>>Not really sure about this. One experiment is worth a thousand guesses
>>I suppose....... I'll try and let you know. :)
>
>
> I did some other checks, like adding an explicit ifconfig eth0 promisc,
> then looking at tcpdump output - I didn't see any stray packets like I
> usually do, just ethernet broadcasts and unicasts to my mac, this also
> points to a problem that the ethernet interface is actually not in
> promisc, while the driver thinks it is.
>
> And it is probably not a driver-only issue. I've got older machines with
> tg3 running fine with bridge (with an older tg3 driver), and eth1 on the
> same machine also runs fine. On another machine I tested today, an IBM
> x326, the same thing happens - eth0 broken, eth1 fine. Would access to one
> of these machines help? :)
>
> Greg
I've got a tg3 card here. I'll try re-create it as soon as I have time.
Just out of curiosity, are you running tcpdump against the physical
interface or the bridged interface? I do recall some issues involving
using PF_PACKET on virtual interfaces, that might cause you to not see
some packets that the physical interface really does receive.
Neil
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