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The other day while reviewing my fireplot graphs, I noticed (yet) another portscan. They’re not unusual. This one took around four and a half hour to complete, and covered a lot of TCP ports on one IPv4 address. That’s not unusual either. The curved graph shown below is caused by the plot’s logarithmic Y axis, […]

Those familiar with port scanning tools (like nmap), have probably heard of the Xmas scan option. This scanning strategy sets some unusual TCP flags, as the man page describes it: Sets the FIN, PSH, and URG flags, lighting the packet up like a Christmas tree. Yesterday, my firewall was systematically scanned with a combination of […]