A few days ago at work, Norton Internet Security warnings popped up on all of our machines almost simultaneously. The details said that an ‘invalid ICMP code’ had been blocked, and when I checked where it originated, it showed a 172.* IP address – from our own local network. It reminded me of that old urban legend about the babysitter, so I sent a quick instant message to my coworker saying “we have to get out of here now - the pings are coming from inside the building!” Sadly, this attempt at geek wit fell flat… oh well, this is what happens when you study too much.




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