Welcome to some great networking and computing tips.
Usually these have to do with how to do this or how to change that. The subjects are fairly broad when it comes to networking and we encourage both your feedback and contributions by adding comments and extending any of the tips. If there is something you need help on or something you would like to see added here, just drop us a line from the “Contact Us” link and we will be glad to try and help.
Be careful, not all tips work on all networking equipment nor operating systems. Also be sure to add your comments as well as read comments and questions from other readers.
You can click on the column titles to sort on the column information (for instance click on Hits to sort the articles in ascending frequency, click it again to sort in descending frequency). You can also select tags in the tag cloud to quickly list all articles on that particular subject.
Using Wireshark in Microsoft Windows reveals some quirks that naturally leave you scratching your head as to what is going on. For example, when I launch Wireshark on my Windows 10 system I see a bunch of different interfaces. Some make sense (Wi-Fi, Ethernet 2) but others….: What are all the Local Area Connections? What […]
What are all the Microsoft local area connections? Read More »
A common question regarding Wireshark packet analysis is “Can I find a text string in a packet capture?” 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 The answer is that it depends on where the text string is
Finding Text Strings in Wireshark Captures Read More »
Example IPv6 Fragmentation Attack
Example IPv6 Fragmentation Attack Read More »
Example IPv6 SYN Flood Attack
Example IPv6 SYN Flood Attack Read More »
I was asked in a recent WLAN class whether you can adjust the power level in a Wi-Fi radio. The answer is yes (if you have the right operating system), and here is how. For this demonstration, I am using Kali Linux but this should work on any Linux. Comment below if you can confirm
Tweaking the Wireless Interface – Power Settings, Country etc. in Linux Read More »
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 Just introduced this week is a terminal version of tshark that looks like the Wireshark GUI call termshark. Why? Let’s say you run either Virtual Machines or Servers without a
A Terminal Version of tshark – we love it! Read More »
We started to notice QUIC back in 2017. For an overview of QUIC you can see my article here: https://www.cellstream.com/2018/03/07/is-there-a-lot-of-quic-in-your-packet-captures/ How do you know if a given web site uses QUIC/gQUIC? It is a great question, and can be easily answered if you are using Google Chrome (which, by now you should be!). First, you
How To Observe if the Web Site you are Browsing Uses QUIC Read More »
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 If you are like me, you count on the Internet to help with how to’s especially when using Linux. That said, sometimes the information can be contradicting or confusing. This
3 Ways to put your Wi-Fi Interface in Monitor Mode in Linux Read More »
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 In our article on putting your WLAN Wi-Fi interface into Monitor Mode so you can sniff Wi-Fi packets and troubleshoot WLAN’s, we said that if you are running
Getting a Virtual Machine to Access Wi-Fi Monitor Mode Read More »
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 MTU (PMTU) discovery.
IPv4/IPv6 Path MTU (PMTU) Discovery Demystified Read More »
I received a question on how to create a delay to a subnet using GNS3. Below is my answer:
Creating Delay to a Subnet Tech Tip Read More »
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 been Windows based.
GNS3 in Linux – Tech Tip – Docker Error Read More »
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. So let’s explore.
The Linux ‘ip’ Command in Networking Read More »
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,” and RFC 2992,
Detecting ECMP in Linux using Paris and Dublin Traceroute Read More »
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 would be simple
Linux Starting Point – Commands You Need To Know Read More »
