As many of you who have been in my classes, or are my clients, know, I am not a fan of the accuracy and meaning of speed tests. Perhaps I am being a little technical here. Over the next several posts, I want to provide some detailed information on Speed Tests. I thought the best […]
What are the best Speed Test tools? 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 »
Wow. What a couple of weeks. Lesson learned: never ever ever ever make a web site environment change right before you go on vacation. Ultimately the issues you all have experienced with this web site were my fault. I take full responsibility. I am sorry. I hope you can forgive me and continue to trust
Apologies for the CellStream.com Site Issues 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 »
A great question in my two day Security class recently. The physical layer (Layer 1) of the layered model is responsible for the transmission of raw data bits over a communication medium. Although it is often considered more secure due to its reliance on physical components, it is still vulnerable to a variety of threats.
What are some examples of Physical Layer Threats in Networking? 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 »
Service provider technicians need routine Wi-Fi skills training and they need to know how to troubleshoot Wi-Fi networks for several important reasons: Troubleshooting Wi-Fi networks is essential for service provider technicians to ensure reliable service, maintain customer satisfaction, and keep up with the fast-paced advancements in networking technology. Because the Wi-Fi network environment is ever
Why ISP Technicians Need Routine Wi-Fi Skills Training Read More »
I am getting asked a lot about this. Below is mix of reporting and my take on what happened and what needs to be done. Just so we are clear: I have no secret inside knowledge or insight into the problems. But if you are looking for a clear explanation, read on. The recent CrowdStrike
What was the nature of the July 2024 CrowdStrike computer outages? Read More »
Network Address Translation (NAT) and Network Port Address Translation (NPAT) are not considered a security function because its primary purpose is to modify the L3 network address information in IPv4 packet headers and L4 port numbers of TCP or UDP while in transit. NAT and NPAT are not needed in IPv6 networking. NAT is primarily
Why are NAT/NPAT not a security function? Read More »
Someone asked the following “getting started” question on the Wireshark Discord site, and it prompted me to write this FAQ to help newcomers to Wireshark understand how to navigate the initial complexity of packet capture. Hi everyone! I’m new here and just downloaded wireshark for a Computer Comm class. I need to capture traffic sent
A Simple Capture and Filter Exercise for Wireshark Read More »
Asynchronous Transfer Mode (ATM) was once seen as a promising Layer 2 networking technology due to its ability to handle a variety of traffic types (voice, video, and data) with high efficiency and quality of service (QoS) performance guarantees. I spent several years working with and then teaching ATM courses to my fellow telecom engineers.
What ever happened to ATM (Asynchronous Transfer Mode)? 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. You can test this
A List of USB Wi-Fi Adapters that support Monitor Mode Read More »
