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Arping

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http://en.wikipedia.org/wiki/Arping


http://linuxcommand.org/man_pages/arping8.html



There is need to investigate and troubleshoot on layer 2, should layer 3 not be in service or a host not ask for an IP address when the lease has expired.


An example is a router losing the switch IP addresses from its cache, it would show for example that the Layer 2 connectivity was working fine and it was the IP table and the DHCP mechanisms keeping it up to date that had gone out of sync.

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