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, you can observe […]
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 »
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 Shell, and MAC-OS.
What is the ‘cat’ command, and how can I use it? 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 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 most system settings
IPv6 Settings (SYSCTL) on Linux Read More »
CellStream, Inc. – Telecom Consulting and Training! 2-Day Instructor Led Hands On Lab Class Available in either Web Based delivery or On-Site Delivery Minimum 10 students – Maximum 16 students Course Description: As more and more networks undertake the Internet Protocol Version 6 (IPv6), details of security weaknesses
CSI-HO-018-B – Hands On Advanced IPv6 Security 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 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 either Npcap or
Using Wireshark to capture between VirtualBox VM’s Read More »
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 interface front end
Zenmap – the nmap GUI Read More »
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 have a complete
Advanced nmap – the nmap Scripting Engine (NSE) Read More »
In a recent video call with a service provider technical lead, it seemed that every question I answered, whether it was about Wi-Fi or network testing/analysis or troubleshooting, I kept referring to, and sharing what I could do on my Linux laptop. It was not surprising that toward the end of the conversation, I was
Time for Rural Service Provider Technical Teams to Adopt 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 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 way to go.
Wi-Fi Network Monitoring & Manipulation in Parrot Linux Read More »
CellStream, Inc. – Telecom Consulting and Training! 2-Day Instructor Led Hands On Lab Class Available in either Web Based delivery or On-Site Delivery Minimum 10 students – Maximum 16 students What Students are Saying About this Class: “[Instructor] covered the information incredibly well and all of it was
CSI-HO-028 – Hands-On Advanced L3 Routing with BGP and OSPF 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 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, so we stayed
GeoIP Add In for Wireshark 2.6 and Later Read More »
