I have two Broadcom 5720 NIC connect to esxi host. One of the nic able to observe whole IP range but the another one showing 'none'. I did a extop and press 'n' shows no network traffic for that vmnic. So as per vmware KB http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2035701. I reload the tg3 driver which resolve the issue. I only did unload and reload the driver and without restart host, problem resolved.I did it through DCUI esx shell as doing over ssh disconnect the network and no way to reload the driver.
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