This section contains general information, tips and tricks, light reading, entertainment and other general fodder. Enjoy!
What is btop? btop (aka btop++) is a modern and visually appealing resource monitoring tool for Linux and other operating systems. It is part of the bpytop family, created by the same developer, and is written in C++ for performance and efficiency. Like htop, btop provides detailed information about system resources, including CPU, memory, disk […]
A Better Linux Resource Monitor Read More »
Here is a list of interesting/useful network/IP commands for Windows. Most of these commands must be run from the CMD app. To do this Open Command Prompt: In the search bar, type cmd and press Enter, or press Win + R to open the Run dialog. Administrative Privileges: In some cases you will need to
Network/IP Commands for Windows Users Read More »
The nslookup command is a built-in network administration tool available on Windows, macOS, and many Linux distributions. It is used to query DNS servers to retrieve information about domain names, IP addresses, and DNS records. Basic Syntax: nslookup [hostname] [DNS server] Components: Common Use Cases: Example Output: Query a Domain: nslookup example.com Output: Server: dns.googleAddress:
What is the ‘nslookup’ command, and how can I use it? Read More »
The dig command, short for “Domain Information Groper,” in Linux or MacOS is a command-line tool used to query Domain Name System (DNS) servers. The command is a lot like nslookup, but at the same time it is different. If you are a Windows user, you have to use nslookup. For a reference on nslookup
What is the ‘dig’ command, and how can I use it? Read More »
For all my troubleshooting network friends, I have compiled a list below of the top software-based network troubleshooting tools that you need to have and know. It you want to add hardware to your toolkit – have a look at our “Go Bag“ #1A – Our Network Troubleshooting Toolkit for Windows or Linux You will
Top 12 Network Troubleshooting Tools Read More »
So often in Wireshark videos and classes we spend a lot of time on TCP behavior. But what I am about to discuss is hardly ever brought up. The answer to version is simple right? Version 4. OK, kind of right, but overlooking too much. The truth is that there are multiple “versions” of TCP,
Which Version of TCP are you using? Read More »
Retransmissions of frames in WLANs (Wireless Local Area Networks) can become problematic for several reasons, primarily due to the nature of the wireless medium. While retransmissions are a necessary part of ensuring data integrity in unreliable networks, they can cause inefficiencies and degrade network performance. I will get to the details below, but let’s start
Recognizing WLAN Retransmissions is a Critical Skill Read More »
As most of my readers, students, and clients know, I absolutely love Wireshark. I deeply am infatuated with Wireshark’s Profiles, more properly called configuration profiles. So much so that many years ago now, I set up the first Wireshark Profiles Repository. 100’s of thousands of downloads have resulted, and I hope I have helped the
Automatically Switch Configuration Profiles in Wireshark Read More »
It’s always tough to do these Top 10 posts. I mean, depending on your job, where you access the network, what it is you are trying to do, you may have some favorite tcpdump commands that I don’t show here. That said, lets take a look at some great tcpdump commands. By the way, you
Top 10 Tcpdump commands Read More »
That’s right folks. I have been searching and searching. I actually gave up for a while as the only thing available was PCIe based adapters. Well that all changed with a search today and this showed up: Here is the link. This will go through my Amazon Associate link – if you buy it, we
A Wi-Fi 7 Tri-Band USB Adapter now available on Amazon Read More »
A CLEAR WORD OF CAUTION – ONLY USE THIS TOOL WHERE YOU HAVE PERMISSION. THIS ARTICLE IS OFFERRED FOR LEARNING PURPOSES ONLY. Hping3 is a network tool designed for packet crafting and analysis, similar to Scapy but with a more command-line-oriented interface. It is often used for testing and troubleshooting network infrastructure, performing security assessments,
What is, and how can you use hping3? Read More »
Windows Firewall allows you to control the traffic entering and leaving your system through various rules. You can create and configure firewall rules to permit or block specific network activities. Below are some examples of Windows Firewall rules, including inbound and outbound rules: Example 1: Allow Inbound Traffic on a Specific Port (e.g., HTTP –
Configuring Windows Firewall Rules using netsh Read More »
Configuring a firewall rule in Ubuntu typically involves using iptables or nftables. I have written a separate article on iptables here. What if we wanted to make life a little less involved. The answer is ufw (Uncomplicated Firewall), which is a user-friendly front-end for managing iptables firewall rules. Here’s how you can do it: Step
A Simple Linux Firewall – ufw Read More »
iptables is a command-line utility in Linux that allows you to configure the rules of the packet filtering and NAT (Network Address Translation) framework, known as netfilter, within the Linux kernel. It is a key tool for managing network traffic and implementing a firewall on Linux systems. Here’s an overview of what iptables does and
How to Configure iptables in Linux Read More »
So many folks use Windows and they want to capture Wi-Fi traffic in Monitor Mode (aka RFMON) using their onboard Wi-Fi adapter, and, for those of us who have tried, we all know how problematic that is. The answer as discussed in my post here is to use an external adapter. Check out these great
A List of USB Wi-Fi Adapters that support Monitor Mode Read More »
