Why large UDP6 packets are malformed over virtio?

Solution Verified - Updated -

Issue

  • UDP6 large packets are malformed over virtio when using virtio_net in guest

Environment

  • RHEL 6.1 OS providing KVM service.


  • RHEL5.6 KVM guest using virtio_net as network driver.


  • Logical Path of Packet in Network Stack

    Application-> eth2 -> virtio_net[guest] -> vnet2[host]-> br2 -> eth0.600 -> eth0 -> bnx2 -> Broadcom 5771x 10G -> switch
    MTU           1500       1500               1500        1500      1500      1504    1504
    

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