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
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• Windows, Linux, and computing optimization recommendations
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• Improving network troubleshooting efficiency
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• Capturing and analyzing packets with Wireshark
• Understanding TCP/IP, DNS, DHCP, Ethernet, and Wi-Fi technologies
• Using industry tools more effectively
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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.
Post Views: 9,371 Check out these additional IPv6 Resources: Our IPv6 overview course at Udemy Our IPv6 Custom Profiles for Wireshark Our IPv6 classes at the Online School A major change in the behavior of IP networks between IPv4 and IPv6 is that in IPv6 networks, all hosts are required to support something called Path […]
IPv4/IPv6 Path MTU (PMTU) Discovery Demystified Read More »
Post Views: 1,515 I received a question on how to create a delay to a subnet using GNS3. Emulating delay on a subnet allows engineers to replicate real-world latency conditions in a controlled lab environment. Production networks—especially broadband, MPLS, SD-WAN, Internet, satellite, or cellular transport paths—rarely behave like low-latency LANs. By introducing deterministic round-trip delay,
Creating Delay to a Subnet Tech Tip Read More »
Post Views: 2,365 I recently watched a YouTube video where one of the GNS3 creators was talking about GNS3 and how it runs. This convinced me to consider moving my GNS3 development work to the Linux world. I had done this years ago for the hands on training classes but my own development environment has
GNS3 in Linux – Tech Tip – Docker Error Read More »
Post Views: 6,255 One way to examine your network configuration in Linux is to use the “ip” command. I have attached a cheat sheet from Red Hat. By itself, it will show its options: So much going on here, and I find the help and man pages to be light on clarity and examples.
The Linux ‘ip’ Command in Networking Read More »
Post Views: 6,897 Equal-Cost Multi-Path (ECMP) is a forwarding mechanism for routing packets along multiple paths of equal cost with the goal to achieve almost equally distributed link load sharing. This, of course, significantly impacts a router’s next-hop (path) decision. For further details, look at RFC 2991, “Multipath Issues in Unicast and Multicast Next-Hop Selection,”
Detecting ECMP in Linux using Paris and Dublin Traceroute Read More »
Post Views: 1,684 My recent blog post regarding Linux being the operating system of choice if you are supporting/testing/operating a network has spawned some great discussion. Emerging the discussion has come a request to write up a starting point list of commands for Linux beginners. I said “Sure, I can do that!” I thought it
Linux Starting Point – Commands You Need To Know Read More »
Post Views: 2,797 The ‘cat’ [short for “concatenate“] command is one of the most frequently used commands in Linux and other operating systems. The cat command allows us to create single or multiple files, view contain of file, concatenate files and redirect output to the terminal or to files. The command is available in Linux, Windows Power
What is the ‘cat’ command, and how can I use it? Read More »
Post Views: 6,813 Check out these additional IPv6 Resources: Our IPv6 overview course at Udemy Our IPv6 Custom Profiles for Wireshark Our IPv6 classes at the Online School Is there a simple way to display all the IPv6 settings on a Linux machine? Absolutely! I have done the following on Debian/Ubuntu Linux. For the newbies
IPv6 Settings (SYSCTL) on Linux Read More »
Post Views: 7,179 Check out these great references as well: Our custom profiles repository for Wireshark Our Udemy course on Wireshark Our Udemy course on Wireless Packet capture A great question and problem. The fundamental answer is you can’t. Why? Depends on who you believe. My conclusion is that Wireshark (really dumpcap) has to use
Using Wireshark to capture between VirtualBox VM’s Read More »
Post Views: 13,413 In our previous articles on nmap ( Getting Started with nmap and Deeper Scanning with nmap and Even Deeper Scanning with nmap and Advanced nmap Scripting Engine) we ran everything from the command line interface of various Linux distributions. When you install nmap, you also get something called ‘Zenmap’ which is the graphical user
Zenmap – the nmap GUI Read More »
Post Views: 13,239 In this article we continue our nmap series (just click on the nmap tag at the bottom of the article to see the other articles), this time we discuss an advanced nmap feature called the NSE: nmap Scripting Engine. This post get’s you started with nmap scripts. Once you get this, we
Advanced nmap – the nmap Scripting Engine (NSE) Read More »
Post Views: 22,416 Check out these great references as well: Our Wireless custom profile for Wireshark Our Udemy course on Wireless Packet capture Our other Wi-Fi related articles Let’s talk about Wi-Fi Network Monitoring & Manipulation in Parrot Linux. If you are doing anything regarding security or penetration testing you know Linux is the only
Wi-Fi Network Monitoring & Manipulation in Parrot Linux Read More »
Post Views: 2,118 Check out these great references as well: Our custom profiles repository for Wireshark Our Udemy course on Wireshark Our Udemy course on Wireless Packet capture Teaching a Wireshark class with some cellular company employees, I was asked how to integrate the GeoIP IP Address resolution. I had not done this for years,
GeoIP Add In for Wireshark 2.6 and Later Read More »
Post Views: 1,791 We have previously published two articles on Google’s QUIC protocol (note: Google originally called this protocol “QUIC” as you can tell by the original logo, but now that original version is referred to as gQUIC, whereas the IETF has chosen to call the newer version they are working on as “QUIC” –
How much QUIC Traffic is there? Read More »
Post Views: 2,289 Since we published the Linux Networking Commands article in October 2017, I have had several comments that I should have included the “My Trace Route” command. Ofcourse, readers were correct, but I felt that this tool deserved its own article. Some of you, depending on what version of Linux you use may
My Traceroute in Linux Read More »
