Tips Tricks, How To’s, and Stuff

This section contains general information, tips and tricks, light reading, entertainment and other general fodder.  Enjoy!

Find and Display All Your Wi-Fi Passwords in Windows

If you have been to one of my Wireshark or Wi-Fi classes then you know I often criticize Microsoft Windows for some of its – well – inexplicable approaches to usage and security.  Here is yet another example.  Let’s say someone has a Rubber Ducky, or some Arduino device, that they want to plug into …

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Troubleshooting Your Network Using Port Mirroring and Packet Capture

Scenario Let’s say you have a DHCP server running on a Cisco Switch that is behaving strangely and you want to examine the traffic over a couple of hours while not creating a gigantic unmanageable capture file. A note here: I am doing this on a Cisco switch, but most all vendor switches support this …

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Troubleshooting The Internet Using Ping (a.k.a. ICMP)

In this article, I wanted to provide a guide to using ping – ICMP Echo – to troubleshoot your network.  Most people use ping on their platform to test if they can reach a given destination.  Just open up a terminal (Linux or MAC OSx) or command line (Windows: Start> Run> cmd) and enter the …

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IPv6 Extension Header PCAP Repository

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 …

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smalllinux

Viewing Users/System Users on Linux

An essential function when administering a Linux system is configuring and managing users and groups. I cover adding users in this article: https://www.cellstream.com/reference-reading/tipsandtricks/582-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 a real …

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smalllinux

Using the useradd Command to Create User Accounts in Linux

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.  …

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Important Updates to Wireshark for Voice and VoIP

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 …

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Wireshark 3.5 Development Release adds significant voice upgrades

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 …

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