This is now bug # 3324181.
I wrote:
>Intel E1G44ET installed in Dell R410 running Fedora with kernel 2.6.32
>x86_64 and driver igb 3.0.22 built from Intel source code.
>
>The interface should be receiving multicast Ethernet (not IP) packets
>addressed to MAC 01:80:C2:00:00:0F, once per second. When sent to the
>motherboard Broadcom NICs, the packets are received. When sent to one of
>the Intel ports, the packets do not appear. The ports are working well
>otherwise.
>
>The test conducted is to run tcpdump on each port independently. With
>the cable from the sending system connected to an Intel port, observe
>that the multicast packets are not seen. Move the cable to a motherboard
>port, observe that the packets are seen. The sending system is not
>altered or touched during the test. Switch back and forth as often as
>desired, the packets only appear when the wire is attached to a
>motherboard port. Other traffic appears correctly when the cable is
>attached to either port. There is no switch between the sending system
>and the system under test.
>
>Background: This is a valid multicast MAC address. Broadcom switches use
>addresses in this range for management and treat such packets in a
>non-standard way. However, as a valid packet with a valid address, the
>packets should traverse other parts of a network unhindered.
>
>This smells like a driver configuration issue (most likely) or a driver
>bug. However, I have not seen any driver configuration parameter that
>seems relevant. Suggestions appreciated.
--
Dave Close, Compata, Irvine CA +1 714 434 7359
[email protected] [email protected]
"Though the people support the government, the government
should not support the people." -- Grover Cleveland
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