Tips Tricks, How To’s, and Stuff

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

Using Traceroute to Determine Paths Through the Internet

How does my traffic to a site on the Internet get there? What path did it follow? These are great questions, and I will attempt to answer them in this article. When you’re on the Internet, information or requests sent from your computer don’t reach the destination computer in a single jump – or hop …

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Creating an NVMe Lab – Option 1

One of the latest developments in compute and storage has been the NVM (Non-Volatile Memory) Express (aka NVMe) that has revolutionized SSD use and speed.  NVM Express (NVMe) is also known as Non-Volatile Memory Host Controller Interface Specification (NVMHCIS) – it is an open, logical-device interface specification for accessing a computer’s non-volatile storage media usually …

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learn wireshark

Zero-to-Hero – Wireshark TCP Conversation Completeness

Introduced in version 3.6 and later is a new Wireshark expert analysis process called TCP Completeness. At first this was quite confusing, but once you get to know what is going on, you come to understand that you can use this new feature to find certain types of TCP issues. We included this is our …

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How To Discover What is on your LAN/WLAN

Who is on my network?  Great question.  Better yet: Who is on my customer’s network?  That would be looking at the issue from a service provider’s perspective. This article attempts to answer that question with tips and tricks and tools that will help you, whether you are the owner of a network or a service provider.  …

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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 viewing, 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 …

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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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