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Network Engineering

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    @Lijok Yep forgot this point of your question, I added the answer to this also. Commented Jan 11, 2018 at 16:35
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    ARP entries typically need to be refreshed periodically, which is likely what you're seeing in the 3rd example. In order to reduce resource utilization of all of the hosts in the broadcast domain, a unicast ARP request can be sent directly to the router to confirm if it is still alive. I would expect that if the router didn't respond to the unicast ARP request then the host would probably try again with a broadcast ARP request to see if gets an answer. I have seen this behavior many times myself, but my reasoning is technically speculation. Commented Jan 12, 2018 at 7:58