Tag Archives: linux
Implementing an IP blocklist with firewalld
In 2013 I wrote about using IP sets and iptables to block IP addresses from a blocklist provided by organizations such as OpenBL. The Bash script I wrote for that was usable at the time, but in the intervening years many Linux distributions (including … Continue reading
Fixing a blank screen in KDE
I have Fedora 21 installed on my laptop (a ThinkPad) and use the KDE window manager. Recently (today, actually) I ran into a bizarre problem with it: after undocking it, the screen went blank. Or technically, it stayed blank instead … Continue reading
VMware VCP5-DCV recertification success
So the other day I took and passed the VMware VCP5-DCV Delta exam (VCP550D) to renew my VCP5-DCV cert. Originally I had no plan to blog about this since I took the exam on the very last day it was … Continue reading
SCALE 13x Linux-IO Presentation Video
I recently attended the SCALE 13x conference in Los Angeles. It was my fourth time attending SCALE and as usual I found it to be an excellent event. Unlike some previous years I didn’t work in the expo hall (no … Continue reading
Dealing with a panel lotto with a ThinkPad
Every laptop I’ve owned in the 21st century has been a ThinkPad. Factors important to me include build quality, reliability, warranty support, and the keyboard, and all of these are typically excellent on ThinkPads. Moreover, major components are typically made by … Continue reading
Mass blocking of evil IP addresses with iptables and IP sets
When running a Linux server or firewall it may be useful to use iptables to block a list of known “evil” IP addresses. There are many organizations maintaining “block lists” of such IPs, such as Spamhaus, DShield, and OpenBL. Blocking … Continue reading