Who's That Knocking At My Door? Go Away!
To supplement this data from the outside world, we also regularly examine data from our systems to ensure that our defense is properly focused. We have an intrusion-detection sensor outside the firewall that logs many attacks, and we also log a great deal at our firewalls. As an exercise, we recently analyzed a week's worth of data down to the last packet and noticed some remarkable trends. I hadn't looked at this data in detail for some time, and I was startled by what we found.
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