A Range of local IP Addresses Are Inaccessible from LAN

Today I ran across an interesting issue.  Everything was normal on the network except that no users could print to ANY of the network printers.  They could not be pinged or accessed in any way.  The network consisted of a single subnet, single server, and single switch.  I moved some of the printers to other …

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Crazy DHCP Server Rootkit

A quick informal story: One of my clients has a bunch of employees that are in and out of the office on different days with their laptops.  A couple of them always seem to get a little bit o’ spyware.  Well, over the past week or so their “server went down” several times randomly and …

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