Welcome to CellStream’s Networking and Computing Tips resource center, where technology professionals, students, and enthusiasts can find practical guidance, troubleshooting techniques, and real-world solutions for today’s networking and computing challenges. Our goal is to help you work smarter, solve problems faster, and build a stronger foundation of technical knowledge.
Whether you’re configuring a network, optimizing system performance, learning a new technology, or troubleshooting a difficult issue, you’ll find valuable insights drawn from decades of industry experience. From Wireshark packet analysis and broadband technologies to Windows, Linux, cybersecurity, Wi-Fi, and Internet protocols, our tips are designed to be practical, actionable, and immediately useful.
• Step-by-step technical guides and how-to articles
• Networking troubleshooting techniques and best practices
• Wireshark tips, packet analysis workflows, and protocol insights
• Windows, Linux, and computing optimization recommendations
• Cybersecurity awareness and protection strategies
• Broadband, Wi-Fi, Ethernet, TCP/IP, and Internet technology guidance
• Productivity tips and tools for network engineers and IT professionals
• Improving network troubleshooting efficiency
• Optimizing computer and operating system performance
• Securing devices, accounts, and data
• Capturing and analyzing packets with Wireshark
• Understanding TCP/IP, DNS, DHCP, Ethernet, and Wi-Fi technologies
• Using industry tools more effectively
We’re always looking for new ideas, questions, and topics to explore. If there’s a networking or computing subject you’d like us to cover, or if you need help solving a technical challenge, connect with us through our Discord community or contact us directly.
Please note that not all tips, procedures, and configuration examples apply to every operating system, network device, software version, or vendor platform. Always verify compatibility and test changes in a controlled environment before implementing them in production networks.
Views: 2,728Have you ever wondered exactly what hardware is inside your computer? Not just how much memory you have or what processor Windows says you’re running, but the actual manufacturer and model of your motherboard, the type and speed of your RAM, the BIOS or UEFI firmware version, and the details of your graphics processor?
How to Identify Your Computer’s Hardware Components Read More »
Views: 2,241One of the challenges of owning and maintaining a Windows PC has always been keeping the operating system, installed applications, device drivers, and other software up to date. I originally wrote this article back in September 2013 and made a few updates in 2020. A lot has changed since then! Fortunately, keeping software updated
Keeping your Windows PC Software Up to Date in 2026 Read More »
Views: 236We promised to deliver some great IPv6 labs to expand your IPv6 skills and the first two are up! Three more are scheduled already! To check them out go here. These labs include full instructions, GNS3 Portable Projects (not required) and PCAPs for Wireshark where needed. Thank you to our Patreon members who keep
IPv6 Lab Exercises Appearing Read More »
Views: 7,455Originally published October 26, 2018 | Updated October 2026 If you have spent much time working with Linux, you probably remember commands such as ifconfig, route, and arp. For years, these utilities were commonly used to examine network interfaces, IP addressing, routing tables, and other networking information. Those commands may still be available on
The Linux ip Command: A Practical Guide to Network Troubleshooting Read More »
Views: 674Most people never think about the Domain Name System (DNS) until something stops working. They enter a website address, press Enter, and expect the page to appear. Somewhere along the way, DNS helps translate the domain name into the IP address needed to reach the destination. What many Internet users do not realize is
Public DNS Servers Explained: Which One Should You Use? Read More »
Views: 278This updated Wireshark Display Filter Cheat Sheet (multi page) is designed as a practical reference for anyone who uses Wireshark for troubleshooting, packet analysis, protocol study, or security work. The original version already covered the basic filter structure, comparison operators, conversation filters, common protocol fields, TCP analysis, Wi-Fi, routing, VoIP, DNS, DHCP, TLS, and
Wireshark Display Filter Cheat Sheet Read More »
Views: 212Are you just getting started with Linux? Are you an occasional user? This is a great cheat sheet to help you with Linux in general. You know I highly recommend that technicians learn Linux. This updated Linux Command Cheat Sheet is designed as a practical reference for anyone working with Linux at the command
A Great Linux Cheat Sheet Read More »
Views: 910Signal has a well-earned reputation as a secure messaging application. Messages, voice calls, video calls, files, and other Signal-to-Signal communications are protected using end-to-end encryption. Signal states that message and call contents cannot be accessed by Signal or other third parties because the communications are always end-to-end encrypted. So that raises an interesting Wireshark
What Can Wireshark Really Tell You About an Encrypted Signal Conversation? Read More »
Views: 565Wireshark display filters can look deceptively simple. For example: tcp.port > 1024 seems obvious. But a TCP packet normally has two port values: a source port and a destination port. That means Wireshark may be evaluating more than one value when you write a filter. Consider: This packet satisfies: tcp.port > 1024 because 53000
Why Your Wireshark Filter May Not Mean What You Think It Means Read More »
Views: 488Most Wireshark users learn display filters by comparing a field to a value: ip.addr == 192.168.1.10 tcp.port == 443 dns.qry.name contains “example” But modern Wireshark display filters can do much more than simple comparisons. The filter language includes functions that can measure field lengths, count repeated fields, manipulate text, compare values, and even convert
10 Wireshark Display Filter Functions You’re Probably Not Using Read More »
Views: 783I discussed correlating packet captures from multiple capture points last week. In that post, one of the things I promised was to dive deeper into clock offsets and clock drift. When troubleshooting from more than one capture point, it is common to compare traffic from places such as: Before those captures can be compared—or
Synchronize Two Wireshark Captures by Correcting Clock Drift Read More »
Views: 633Wireshark gives us thousands of protocol fields to filter on: But what happens when the exact information you want isn’t exposed as a field? That is where Wireshark’s Slice Operator becomes extremely useful. A slice lets you select specific bytes from a field, payload, protocol, or even the captured frame itself. For example: eth.src[0:3]
Wireshark’s Slice Operator: Search Exact Bytes Without Writing a Dissector Read More »
Views: 883So many times I have watched YouTube videos and read articles that jump right into Wireshark troubleshooting of multiple captures of a network conversation or event from multiple points in the network. To me, that can be unnecessarily overwhelming to those learning packet capture. In many videos, it never becomes clear why two different
Correlating Multiple Wireshark Captures: Follow the Same Packet Across the Network Read More »
Views: 724If you work with VoIP, and more specifically SIP long enough, eventually you find yourself staring at an INVITE, a handful of provisional responses, several IP addresses, a 200 OK, an ACK, and perhaps a BYE—and trying to mentally reconstruct what actually happened. Wireshark can certainly do this. In fact, Wireshark remains one of
sngrep: The SIP Troubleshooting Tool You Should Know Read More »
Views: 467Most Wireshark users eventually discover Custom Columns. Instead of being limited to the standard Source, Destination, Protocol, Length, and Info columns, you can add useful fields such as: tcp.stream tcp.analysis.ack_rtt dns.qry.name vlan.id That alone can make packet analysis much easier. But in newer versions of Wireshark, Custom Columns can do much more than simply
Turn Wireshark Columns into Calculated Network Analytics Read More »
