When I started writing this column in autumn of 2000, I had the day job of firewall engineer. I enjoyed that type of work, but I was enough of a big-picture kind of guy to be aware that every year, ...

The Linux kernel includes some of the most powerful and flexible firewall code in any general-purpose operating system. This code is called Netfilter, though most of us refer to it by the name of its ...

News about viruses and ransomware seems to be a daily occurrence. In some cases systems are breached because of direct attacks on the system or through other means such as via email attachments or ...