I have experienced these symptoms when ESXi is configured for Fail-over with one adapter active and one adapter in standby and I have also experienced the same symptoms in the load-balancing configuration described below. I believe that in my situation when ESXi is configured to use two network adapters that it takes all frames received on vmnic0 and re-transmits them on vmnic1 and vice-vesa. After some brief troubleshooting I discovered that I was able to stop these erroneous frames by disabling NIC teaming on my VMWare host. While performing a tcpdump on an unrelated host I discovered that it was being bombarded with ethernet frames destined for the MAC address of a VM located on a host on the other side of the data centre.
I have a HP Proliant D元80 G5 running ESXi 5.1.0 connected to a Cisco 3750 Switch Stack.
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