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 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 »
At our Online School of Network Science, we have created a Network Scientist Tool Belt. This completely free resource is available for you to access, learn and add software and hardware tools to troubleshoot todays networks. You will just need to set up a free account, and the link will get you there. You will
The Network Scientists Tool Belt Read More »
If you are new to Ansible, I suggest you read our article that defines Ansible, and shows you how to set up an Ansible lab environment to test and learn in. You can also read my article on real world use cases for Ansible right here. One of those use cases is Compliance Testing. Let’s
Two Ansible Network Compliance Examples Read More »
Load balancing in data networking is the process of distributing network traffic or workloads across multiple resources—such as servers, links, or devices—to: It’s commonly used in: Here is a structured list of the load balancing algorithms used in data networking, across Layer 4, Layer 7, and routing scenarios: 1. Round Robin 2. Weighted Round Robin
Load Balancing in Data Networks Read More »
Ansible is widely used in data networking for automating configuration, management, and compliance across diverse network devices. We published an article on what this tool is, and how you can set up a lab environment for learning this tool that you can read here. Here are real-world examples of Ansible use cases in data networking:
Real World Use Cases for Ansible in Networking Read More »
Hi everyone! As many of you who have attended my conference presentations and Wi-Fi classes know, I spend time talking about the correct way of troubleshooting Wi-Fi networks. Power cycling or rebooting is NOT a first step. Here’s why: lets say you are having issues of some kind (slow speed, connectivity issues, can’t reach certain
Our Comprehensive Wi-Fi Troubleshooting Guide Read More »
In this tutorial I am going to make you a pro at using and leveraging the Wireshark TCP Graphing tools. As many of you who have taken my Wireshark Courses know, I am a big fan of visualizing what is going on in a given packet capture or conversation. My #2 troubleshooting step is to
Zero to Hero with Wireshark TCP Graphs: A Tutorial Read More »
Below is a great TCP Analysis Flags Cheat Sheet for Wireshark. These are essentially Display Filters. They are all included in our TCP troubleshooting profile you can find here. Analysis Flags/Display filter Trigger Impact/Meaning/Notes tcp.analysis.ack_lost_segment A segment that is not in the trace has been acknowledged Indicates that not all packets have been recorded or a route has been flapped tcp.analysis.duplicate_ack The receiver
Wireshark TCP Analysis Flags Cheat Sheet Read More »
The following commands are like a cheat sheet of essential Windows repair commands. DO NOT USE THESE UNLESS YOU KNOW WHAT YOU ARE DOING. RESEARCH EVERY ONE OF THESE COMMANDS BEFORE EXECUTING. BACK UP YOUR SYSTEM PROPERLY. Command Purpose sfc /scannow Scans and Repairs corrupted or missing system files with the System File Checker (see
Windows Essential Repair Commands Read More »
As QUIC has emerged to begin its takeover of the Transport Layer (OK – we will never see TCP totally disappear), I have written multiple articles on QUIC. You can look them over here. In the early days Google made this really easy right within the Chrome web browser. As time has gone on and
Troubleshooting QUIC Traffic – Not Easy Read More »
Let’s start with some simple definitions of these protocols and how they work together. In Voice over IP (VoIP) to PSTN (telephone) network integration, MGCP and C15 can work together as part of a layered signaling architecture that bridges IP-based call control with traditional PSTN switching systems. Here’s how they fit and interact: MGCP (Media
Troubleshooting C15 and MGCP Protocols for VoIP Read More »
