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+Arping is an ARP level ping utility. It's good for finding out if an IP
+is taken before you have routing to that subnet. It can also ping MAC
+addresses directly.
+
+It broadcasts a who-has ARP packet on the network and prints answers -
+very useful when you are trying to pick an unused IP for a net to which
+you don't yet have routing.
+
+This requires libnet.