Problems connecting to a host

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Users are reporting problems connecting to a host.  The firewall on the host is configured to block incoming ICMP packets.  The host is on the same IP subnet as your computer. 

What tool can be used to test whether the host is connected to the network?

You can use arping.  The arping command sends Address Resolution Protocol (ARP) packets to test connectivity.  But, since ARP is not a routable protocol, the computers must be located on the same subnet.

What is arping?

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