Tux Machines
Posted by Roy Schestowitz on Jan 19, 2023
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=> ↺ Block/Unblock Ping ICMP Requests in the Linux System
Ping is the most commonly used command-line utility used by many sysadmins or network engineers to check whether a target machine is up or down in a given network.
We already discussed how this command works in a separate article; click here to read it. For a quick note, it sends ICMP requests to the target machine and waits for a response. Once the response is received, it’s concluded that the target machine is alive on the network.
This tool is supposed to show the status of a target machine on a given network, but many network intruders or hackers (especially newbies) use it to find active systems on the network to attack.
Now, if you’re worried about security, you can stop accepting ping requests (ICMP echo) from any system on the network by following the steps in this article.
=> ↺ How to Install pip3 on Ubuntu
This article shows you how to disable or enable ping ICMP requests on a Linux system, either temporarily or permanently.
=> ↺ How To List All SELinux Contexts [2023] | Itsubuntu.com
Security-Enhanced Linux (SELinux) is a Linux security model where administrators can determine the access of the system for other users. SELinux defines access controls for the applications, processes, and files on Linux. It uses a set of rules or policies that tell SELinux what can or can’t be accessed. It was originally developed by the United States National Security Agency (NSA) and was released to the open-source community in 2000. It was integrated into the upstream Linux kernel in 2003.
=> ↺ How to run queries and use policies to monitor your system in FleetDM | Enable Sysadmin
Use FleetDM to run queries across your Osquery-enabled hosts, aggregate the results for easier processing, and use policies to evaluate compliance with standards.
=> ↺ How to install WSJT-X on Linux Mint using APT or Flatpak
WSJT-X is an open-source software suite for Windows, macOS, and Linux. It is used for weak-signal radio communications and is popular among amateur radio operators. To perform several modes of operation, WSJT-X includes programs such as JT65, JT9, FT8, and WSPR.
=> ↺ How to Upgrade from Debian 10 Buster to Debian 11 Bullseye
Debian is a popular Linux distribution known for its stability and security. The latest version of Debian, known as Bullseye, was released on August 14th, 2021, and offers several new features and improvements over the previous version, Debian 10 Buster. This article will guide you through upgrading your Debian 10 Buster to Debian 11 Bullseye.
Before you begin, it is essential to note that upgrading your Debian distribution can be risky. It is always a good idea to back up your important files and data before proceeding.
=> ↺ Get Kubernetes Ingress Log for Debugging
Do you know what the Get Kubernetes ingress log for debugging is? Networking problems are increasingly more challenging to diagnose as deployments grow larger and larger. This tutorial shows you how to use the ingress-nginx kubectl plugin to debug the access to your application through the ingress controller. Let’s first see the definition of Kubernetes ingress which is important to understand the main topic better.
=> ↺ How to Setup a Local or Private Ubuntu Mirror
Based on my own research, it seems that the tool Debmirror is the most simple and straight-forward way to create a local Ubuntu mirror with a reasonable data footprint of about 480 GB (2023) for both Jammy AMD64 (22.04) and Focal AMD64 (20.04).
Based on on your needs, you can further finetune Debmirror to only download the pacakges that you need for your environment.
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