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Just to complement all other answers, I found this link very usefull: http://linux-audit.com/how-to-clear-the-arp-cache-on-linux/ In some cases using the IP Tool is more appropriate, like the command: # ip -s -s neigh flush all But everything will depend of your necessity and what and how the kernel implements this things.


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I would ask myself: What ip address on the subnet is the arp table entry mapping a mac address for (i.e. which host does the entry point to)? Is the arp table entry persistent or not (i.e. can I expect it to auto-purge from the arp table)? Have I sniffed traffic through the relevant interface during the test interval (to find or not find evidence for arp ...


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From http://linux-ip.net/html/ether-arp.html: If no ARP cache entry exists for a requested destination IP, the kernel will generate mcast_solicit ARP requests until receiving an answer. During this discovery period, the ARP cache entry will be listed in an incomplete state. If the lookup does not succeed after the specified number of ARP requests, the ARP ...


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The host does not exist to respond to the ARP query. So your client is unable to even craft an ICMP packet, destined to the "would be" MAC address of the IP you are trying to ping. In fact, nothing your computer can do would enable it to craft such a packet if it is unable to resolve the MAC address through ARP. As such, that destination host is ...



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