Received DUP when using ping. What should I do?

I was pinging Google last night and one of them came back as DUP(!). I did some reading and I found this in the man pages on ping(8):

Damaged packets are obviously serious cause for alarm and often indicate broken hardware somewhere in the ping packet's path (in the network or in the hosts).

Is this really a cause for serious alarm? if it is what should I do?

This occurred on a Windows 7 PC running Ubuntu Live (14.04) via usb drive. It is plugged into the internet with an Ethernet cable (cat 6?). It is using a PlugLink to connect to the router. I believe the provider is ATT Uverse.

edited to link to the man page referenced.