This section contains general information, tips and tricks, light reading, entertainment and other general fodder. Enjoy!
Too many people shrug off Linux for fears of security with a free and open source operating system, even today. For those of us who know that Linux is no less or more secure than any other operating system, we must be sensitive to this and we must be well versed in Linux commands that […]
Linux Security Focused Commands We All Need to Use Read More »
Hello my Networking and IPv6 researchers and enthusiasts. I just started a PCAP repository at Github for IPv6 Extension Header (EH) packet capture examples. Honestly I found nothing worthwhile on the web, that’s not to say they don’t exists in some niche place, but I wanted something easy to access and easy to add content
IPv6 Extension Header PCAP Repository Read More »
An essential function when administering a Linux system is viewing, configuring and managing users and groups. I cover adding users in this article: https://www.cellstream.com/2022/04/06/using-the-useradd-command-to-create-user-accounts-in-linux/ That said, viewing users is done using a few simple commands. How To View Users on a Linux System Every user on a Linux system, whether created as an account for
Viewing Users/System Users on Linux Read More »
Like most operating systems, Linux can have multiple user accounts. The system administrator or root account, or users with sudo privileges are responsible for managing these users, as well as managing those accounts. Linux is a multi-user system, which means that more than one person can interact with the same system at the same time.
Using the useradd Command to Create User Accounts in Linux Read More »
I have been teaching Hands On IPv6 courses since 2011 – OMG thats 10 years plus!!! Over the course of time, the Internet Engineering Task Force and various companies have been expanding and detailing IPv6 implementation and specification. As our students know, we are very diligent updating our courses thanks to our Online School and
A Better and Complete IPv6 Bibliography Read More »
OK – so this article is for entertainment of all us network nerds. As many already know, pretty much every year, the Internet Engineering Task Force (IETF) releases humorous RFC’s – jokes. Usually these happen on or about April 1st to commemorate April Fools Day. Without doubt, some of these are classic and hilarious.
Humorous and April Fools Day RFC’s Read More »
Hi everyone! Happy Thanksgiving 2021. Just released – Wireshark 3.6.0!!! Why is this important to me, you, and everyone who troubleshoots Voice traffic using Wireshark? Well, there are many changes to the voice related functionality in Wireshark in this (actually as part of the 3.5.0) release. Of course, more than VoIP was updated in these
Important Updates to Wireshark for Voice and VoIP Read More »
Hi Everyone! If you are like me, you use Wireshark every day. For me that means troubleshooting many different network situations, including Voice traffic – VoIP. Wireshark announced some significant changes coming to the Voice capabilities set within Wireshark, and I hope you are like me – extremely excited to see these. If you want
Wireshark 3.5 Development Release adds significant voice upgrades Read More »
Here is a quick and clever technique in Wireshark. Let’s say you want to present, testify, or teach about a packet capture in Wireshark, but you want to redact information that is not important, perhaps hiding an error that was made, or some information that is private, or some other reason. Redaction is often done
Redaction Technique in Wireshark Read More »
Say it isn’t true! For the first time in the world (for me) I can put a Wi-Fi interface on a Windows 10 machine into Monitor mode!!!!! Monitor Mode in Windows At Last! I know, this is boring to a few of you because you have been capable of this. You are spoiled. You are
Monitor Mode in Windows At Last Read More »
I got this question the other day: “What does the BGP Next-Hop-Self command actually do?” It is a great question that I tried to answer in a brief description without success, and actually repeated my answer several times. It was clear to me that my answer was not being understood in terms of a process
What does the BGP Next-Hop-Self Command Actually do? Read More »
This article will discuss how to use some cool bandwidth monitoring tools in Linux so that you have a screen that looks like this: The first thing we will need is a multi-tab flexible terminal emulator. My choice is Tilix, but there are others like Terminator. sudo apt install tilix -y Now that you have
Cool Bandwidth Monitoring in Linux Read More »
Did you know that you can customize the Wireshark window title? The first time I ran across this was when using GNS3. Whenever I did a packet capture in my GNS3 environment the Wireshark window title would be changed to show which link I had done the capture on: A little digging, and I found
Modifying the Wireshark Window Title Read More »
If you are a Linux user, you know how important the Terminal is to your compute world. Here are Seven Awesome Linux Terminal Utilities for Everyone. Now there are a bunch of different Terminals in Linux, this article is not about that, but I like Tilix the best: sudo apt install tilix Instead, this article
Seven Awesome Linux Terminal Utilities for Everyone Read More »
Yes yes, you can always use an IPv4 calculator to determine the IPv4 subnet addresses, and most of these are free. If you want to dig deeper into how IPv4 subnetting works, check out how I have always done this by hand. My IPv4 Subnetting Illustrated method is extremely helpful in certification classes, interview questions/tests
IPv4 Subnetting Illustrated Read More »
