//usage: "[-fqbDUA] [-c CNT] [-w TIMEOUT] [-I IFACE] [-s SRC_IP] DST_IP"
//usage:#define arping_full_usage "\n\n"
//usage: "Send ARP requests/replies\n"
-//usage: "\nOptions:"
//usage: "\n -f Quit on first ARP reply"
//usage: "\n -q Quiet"
//usage: "\n -b Keep broadcasting, don't go unicast"