Frequently Asked Questions

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Have a question about networking or computing?  Hopefully you can find an answer here!

Frequently asked questions about the CellStream consulting and training services are answered here as well as number of other topics.  If you would like to ask us a question, it is easy to contact us.

We hope you find the content here useful.

A Simple Capture and Filter Exercise for Wireshark

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 […]

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What ever happened to ATM (Asynchronous Transfer Mode)?

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. 

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learn wireshark

Where can I get PCAP Packet Captures for Learning and Exploration?

I am often asked this question of where to access PCAP or PCAP-NG files so that folks can explore packet captures using Wireshark.  I have always provided these resources in my Wireshark classes at the Online School, but thought I should also just list them here for public consumption. Look up the hashtag “captureeveryday” in

Where can I get PCAP Packet Captures for Learning and Exploration? Read More »

learn wireshark

How do I install / upgrade Wireshark in Ubuntu Linux?

How do I install / upgrade Wireshark in Ubuntu Linux?  First things first – the Wireshark downloads page is here: https://www.wireshark.org/download.html I know I have put the answer to this in other articles over the years (like this one), but I think it is appropriate to answer the question directly and specifically. Installing Wireshark in

How do I install / upgrade Wireshark in Ubuntu Linux? Read More »

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How do I get Windows interfaces to show up in Wireshark?

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 Apparently this is a common problem, where on Windows systems you do not see any interfaces: There are a couple of things to try: 1. If you are using the

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If I want to get into Networking, what should I learn?

I was recently asked the question “If I want to get into Networking, what should I learn?” A great question because Telecommunications or Data Networking is really not a degree program at most universities, at least not at the undergraduate level.  There are some masters programs, but they are few and far between.  In fact,

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Why don’t you employ the “click” model on your sites?

This is a great question recently asked by one of our students/clients when we said our ususal introductory comments that “No we won’t spam you”, and “No we don’t use the click model on our sites”.   Let’s talk spam.  We have never spammed our students/customers and we have an anti-spam policy.  You are automatically

Why don’t you employ the “click” model on your sites? Read More »

How do I reset my “Default” profile in Wireshark?

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     This is a commonly asked question that usually results from users learning the can have different profiles after they have spent months constantly changing the default profile! Luckily

How do I reset my “Default” profile in Wireshark? Read More »

2021 04 05 7 44 15

What are some network related command line tools within Windows?

This is a great question.  The latest list (when this was written) is: Arp – Displays and modifies entries in the Address Resolution Protocol (ARP) cache, which contains one or more tables that are used to store IP addresses and their resolved Ethernet or Token Ring physical addresses. There is a separate table for each Ethernet

What are some network related command line tools within Windows? Read More »

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