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ping (DUP!)

I sometimes use the following command to check my connectivity

ping -a

Thant cool IP address is actually the main Google DNS server and it is probably a good target to query with ping because it is most likely UP and available to respond to pings.

For the first time today I had a response to a ping with a (DUP!) sting as a trailer, like this:

64 bytes from icmp_req=304 ttl=50 time=371 ms (DUP!)

Does anybody know what does it mean?