I'm not sure I've ever seen this before. 64 packets were sent during a ping session, but we got 65 back? Where did the extra packet come from?
According to Occam's Razor, the most simple explanation is the one that is usually right, so there can only be one explanation...
The other packet... CAME BACK FROM THE FUTURE!
Ladies and gentlemen of the peanut gallery, listen to me for a second. This is a packet from the future, and things that come back from the future can only do two things: They can come to warn us about impending doom, or they can come to kill John Connor. Since Connor is already busy dealing with machines that look like old bodybuilders, we can safely assume that SkyNet would not send a packet to finish the job—that would be wastefully redundant on the machine's part. So what we have here is a crystal-clear case of a packet that is obviously trying to warn us about something. But what is it trying to tell us? It didn't come in a DeLorean, so it cannot have anything to do with Marty's kids... so what could it be? Will we be able to sleep at night again?