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ARPing is an utility that can be used to ping using ARP requests instead of using ICMP as used in standard Ping utility.

Because it involves ARP, arping is limited to the local network to which the server or the interface (if more than one interface) is connected to. ARPing can be quite useful to

• Check if an IP Address is already in use before assigning to another device
• Duplicate address detection
• Update neighbors ARP cache

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ArpWatch is an opensource tool that monitors ethernet or FDDI network activity in the network and maintains a database of IP Address to MAC address mappings. Arpwatch notify via email if there is a change. Arpwacth is most commonly used to detect ARP Spoofing security issues in the network. Arpwatch can run on most of the Linux distributions,UNIX and Sun Solaris.

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