When `systemctl` Confuses You (And When It Won’t Work At All) A super common mistake: assuming every Linux server uses systemd and blindly copy-pasting systemctl commands from some blog. If your terminal answers with something like: bash: systemctl: command not found or systemctl: command not found there’s a good chance your distro isn’t using systemd at all. In that case,…
Read More »Sometimes you wanted to get rid of your crappy ISP DNS servers for good. I’m using wvdial to dial up, here’s what I do. Steps: [*] Disable usepeerdns. Edit “/etc/ppp/peers/wvdial” file. Commented the usepeerdns line. Here’s what is should look: #usepeerdns [*] Disable Auto DNS in wvdial. Edit “/etc/wvdial.conf” file. Set Auto DNS Off. Auto DNS = Off [*] Add…
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Why Your Port Forwarding Isn’t Working A very common mistake with port forwarding on Linux is assuming a single DNAT rule is enough. You add one iptables rule, try to hit your server from outside, and… nothing. In reality, proper forwarding through a Linux gateway needs three things working together: IP forwarding in the kernel, packet filtering rules in the…
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Introduction: The Casio Protrek is a popular line of outdoor watches that are known for their durability and accuracy. However, some Protrek watches can sometimes display the error message “OP EN” or “OPEN”. This error message usually means that the watch’s battery is low or that the watch is not properly sealed. Causes of the Error: There are a…
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If you’re staring at a wall of iptables rules wondering what on earth is going on, you’re not alone. Linux firewalls can feel hostile when all you want is: “Let the right packets in, keep the wrong packets out, and don’t break SSH.” This guide walks through the basic architecture of iptables and netfilter so you understand where your rules…
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If you break your sudoers file, you can lock yourself out of root. That’s the nightmare we’re trying to avoid here. This guide is for anyone managing Linux servers (VPS, bare metal, cloud instances) who needs to give or adjust sudo access without shooting their future self in the foot. I’ll walk you through how to use visudo correctly, how…
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