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 ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
