Author name: Andrew Walding

Andrew Walding is the founder and president of CellStream, Inc., bringing more than 30 years of experience in telecommunications, broadband networking, Internet technologies, and technical education. His expertise spans network engineering, wireless and wireline communications, packet analysis, network operations, emerging technologies, and the design and delivery of advanced technical training programs. A Cisco-certified professional, IPv6-certified specialist, and CBRS Certified Professional Installer (CPI), he helps organizations and technology professionals understand, deploy, troubleshoot, and optimize modern communications networks.

*FREE* – Fiber Optics Termination

Online Self Paced Courses / By

Post Views: 12,617 Contained in this course are a series of videos demonstrations/tutorials that show you how to terminate Fiber Optics using the appropriate tools. Click Here to go to our Online Courses. Are you looking for some network tools that include great fiber toolkits?  Look here.   This is a free, self-paced course available

*FREE* – Fiber Optics Termination Read More »

, , , , , ,

IPv4/IPv6 Path MTU (PMTU) Discovery Demystified

Networking and Computing Tips and Tricks / By

Post Views: 10,388 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 »

, ,

Creating Delay to a Subnet Tech Tip

Networking and Computing Tips and Tricks / By

Post Views: 1,857 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 »

, , ,

Detecting ECMP in Linux using Paris and Dublin Traceroute

Networking and Computing Tips and Tricks / By

Post Views: 8,338 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 »

, ,

Linux Starting Point – Commands You Need To Know

Networking and Computing Tips and Tricks / By

Post Views: 1,961 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 »

What is the ‘cat’ command, and how can I use it?

Networking and Computing Tips and Tricks / By

Post Views: 3,115 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 »

Scroll to Top