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CC3100: ARP Requests Failing

Part Number: CC3100

Hello,

We've noticed that a lot of our devices fail to respond to ARP requests.

Some devices have a 0% success rate responding to ARP requests while others sit around 85-90%.

This was determined using the arping command. E.g.: arping -c 10000 <device_IP>

Does the CC3100 only support Gratuitous ARP? If so, is it periodic or only at boot-time? 

Is the ARP service disabled somehow? If so, how can I re-enable (All I could find is an API to flush the ARP table).