Welcome to our vibrant hub for all things networking and computing! At CellStream, we believe in empowering you with the knowledge to master your digital world. Whether you’re a beginner looking for foundational advice or a tech-savvy enthusiast seeking advanced techniques, our Computing Tips section is your go-to destination.
If there is something you need help on or something you would like to see added here, just drop us a line at our Discord server and we will be glad to try and help.
Be careful, not all tips work on all networking equipment nor operating systems.
Here’s a solid toolbox of Windows PowerShell commands used for network troubleshooting, with quick notes on what each one is good for. I’ll try to group them by task so they are a little easier to remember. 1. Basic Connectivity & “Ping-Style” Tests Test-Connection PowerShell’s ping (ICMP echo) equivalent. Test-NetConnection More advanced tester: port check […]
PowerShell Commands Used for Network Troubleshooting Read More »
I provide this information for reference when examining TLS in Wireshark. The TLS 1.2 protocol ladder (also called the TLS handshake ladder) describes the step-by-step sequence of message exchanges between a client and server as they negotiate a secure, encrypted connection. Think of it as a “ladder” where each side alternates rungs (messages) upward until
The TLS 1.2 Protocol Ladder Read More »
Using a loopback adapter (also called a local loopback interface) for packet capture in Wireshark allows you to capture traffic that stays within your own computer — for example, packets exchanged between local applications via localhost or 127.0.0.1. Normally, this traffic never reaches a physical network interface, so a loopback capture is needed to see
What is the Adapter for loopback traffic capture in Wireshark? Read More »
Many technicians and network engineering staff, as well as IT staff, often need to “tap” into the Ethernet to capture and troubleshoot network traffic. A full-duplex tap (also called a network tap) is a hardware device placed inline on an Ethernet link that allows network engineers to capture all traffic traveling in both directions —
Ethernet Taps to Capture Network Traffic Read More »
I am a ChatGPT subscriber to the basic (not PRO) service. I saw the following post on LinkedIn and was fascinated: Think about the implications. You don’t need to know how to use Wireshark other than to do a capture. You certainly don’t need to know how to troubleshoot packet captures as ChatGPT can do
Can ChatGPT 5 analyze PCAP’s? Read More »
Before anything, I want to thank my user @LeoRegem on Discord for providing the information below. Thank you! Join us there is you want to comment. Here are the steps for capturing WLAN Wi-Fi packets on Android (basically getting into monitor mode and selecting channels, etc): Once you have this set, you can capture on
Capturing WLAN Wi-Fi Packets on Android Read More »
Knowing how to use nmap is critically important for cybersecurity professionals because it is one of the most powerful and versatile tools for network reconnaissance, security auditing, and vulnerability assessment. Nmap is to cybersecurity what a stethoscope is to a doctor—a diagnostic tool that’s fundamental to identifying issues, assessing risk, and maintaining a secure environment.
Using nmap for Cybersecurity Read More »
In our post introducing the nmap Scripting Engine (NSE) we discuss what the nmap scripting engine is and how to use it. In this post I wanted to provide a full list of all the nmap scripts. There are (as of this writing) 612 NSE scripts and 139 NSE Libraries. The source for this information
A Complete List of nmap Scripts Read More »
RFMON stands for Radio Frequency MONitor mode. It is a special mode for wireless network interfaces that allows a device to capture all radio traffic it can receive on a wireless channel, regardless of the intended recipient. All Wi-Fi radios can go into different modes, but that does not mean you can make that happen.
WlanHelper.exe is a command-line tool from the Windows Driver Kit (WDK) and the folks at nmap/npcap that is used to manipulate advanced Wi-Fi driver settings, especially for testing and development. It allows you to control wireless network adapter settings such as: Do You Already Have WlanHelper? It’s possible if you have installed Wireshark with the
WlanHelper: How to Use It in Windows Read More »
Here are several VoIP troubleshooting checklists and tools, organized by focus area to help quickly identify and resolve common issues. These checklists are especially useful for IT admins, NOC teams, and VoIP engineers. Are they “the bees knees” of troubleshooting VoIP? No. In fact, if you have feedback or comments on improving these lists, please
Some VoIP Troubleshooting Checklists and Tools Read More »
As a frequent reader here will know, my Wi-Fi Analyzer of choice is called WinFi. It has been around many years as is fabulous. In version 2, and the new version 3, you can capture Wi-Fi Beacon Frames and examine them. This post will explain what you can capture and how this is useful. What
Capturing Wi-Fi Beacon Frames with WinFi Read More »
PJSIP is a free, open-source multimedia communication library written in C that is used for troubleshooting VoIP. PJSIP implements standard-based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE, targeting VoIP (Voice over IP) applications, including SIP signaling and media handling. You will find the project at github here. What Is the PJSIP Tool?
VoIP Troubleshooting with PJSIP Read More »
This article discusses what SIP pings are, and how to use them in troubleshooting VoIP (Voice over IP) networking. A SIP ping in VoIP is a diagnostic method used to check the availability and responsiveness of a SIP (Session Initiation Protocol) server or endpoint. It’s similar in concept to an ICMP ping, but it uses
What are and how to use SIP Pings in VoIP Read More »
When testing the Internet, there are several key tools we use in troubleshooting: one of them is ping. To verify a particular IP address is operational we “ping 192.168.0.1” from the command line to see if we get an answer back, letting us know that the system we are pinging and the network itself is
SIP Testing and Troubleshooting with sipsak Read More »