Bug fix.
This is an easy ping tool.
The main feature is
・ Supports IPv4 / IPv6
・ Interval / Count can be changed
・ Send from the destination history
Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network.
Ping measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.
Referenced from Wikipedia.
