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.

Testing/Baselining DNS Server Performance

Post Views: 2,002 As a follow on to our DNS In Depth article, we wanted to provide a reference to a great tool. One of the important impacts to how fast the Internet works for users is how fast the Domain Name Service responds to database requests.  For example, if you type www.cellstream.com into your URL

Testing/Baselining DNS Server Performance Read More »

, , ,

Using Ansible for Network Automation

Post Views: 1,916 Ansible is an open-source automation tool primarily used for configuration management, application deployment, and task automation. In network automation, Ansible enables IT teams to manage and configure network devices in a consistent, repeatable, and agentless manner. Ansible is a tool used to automate Server provisioning and network provisioning.  Ansible is completely free! 

Using Ansible for Network Automation Read More »

, , ,

Is there a lot of QUIC in your Packet Captures?

Post Views: 1,977 Have you noticed a lot of QUIC protocol in your packet captures?  I certainly have, and we had better talk about what this is.  What is QUIC (now more recently called gQUIC)? QUIC is a new protocol created by the fine folks at Google.  It stands for Google Quick UDP Internet Connections. 

Is there a lot of QUIC in your Packet Captures? Read More »

, ,

tshark Use in Wireless Networking

Post Views: 1,905 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 As those who have studied our Wireless Profile (available from the Profile Repository) know, there are a number of great display filters used to hunt down issues

tshark Use in Wireless Networking Read More »

, , ,

Perhaps a top 15 Wireshark Capture Filter List

Post Views: 4,409 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 Perhaps…. Of course you can edit these with appropriate addresses and numbers. The ones used are just examples.  Unlike Wireshark’s Display Filter syntax, Capture filters use Berkley

Perhaps a top 15 Wireshark Capture Filter List Read More »

, ,

CSI-HO-027 – Hands On GNS3 – 2 Day

Post Views: 12,302    CellStream, Inc. – Telecom Consulting and Training!             2-Day Instructor Led Hands On Lab ClassAvailable in either Web Based delivery or On-Site DeliveryMinimum 10 students – Maximum 20 students Course Description: This course specifically gives you the tools you need to build your own network in your

CSI-HO-027 – Hands On GNS3 – 2 Day Read More »

, , ,

What is the ‘area range’ command in OSPF?

Post Views: 2,242 Check out these additional Routing Resources: Our IP Routing course at Udemy Our Custom Profiles for Wireshark Classes at the Online School This is commonly asked question from our routing courses and routing discussions in other courses.  Let’s explain this command in this article. To start, you have to know that OSPF

What is the ‘area range’ command in OSPF? Read More »

, ,

What is the “network” Command in OSPF and BGP?

Post Views: 2,127 Check out these additional Routing Resources: Our IP Routing course at Udemy Our Custom Profiles for Wireshark Classes at the Online School In a recent course on IPv6, one of my students asked what the “network” command did as we were beginning to study the routing commands used in Cisco IOS when

What is the “network” Command in OSPF and BGP? Read More »

, , ,

Deleting Remembered Wi-Fi Networks in Windows, MacOS, and Linux (Debian)

Post Views: 3,016 If you attend our WLAN Operations course, one of the things we discuss is Active Scanning.  Your system uses your saved Wi-Fi networks to actively scan for those networks (probing).  There are potential security risks in this, especially with free networks.  Most students conclude they should not remember networks in this way. 

Deleting Remembered Wi-Fi Networks in Windows, MacOS, and Linux (Debian) Read More »

, , , , , ,

Complaint: Why Don’t You Allow Employees to use Wireshark?

Post Views: 1,493 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  Let me begin with a little background.  At CellStream, and the Online School of Network Sciences, we have taught hundreds of Wireshark classes for general networking, voice

Complaint: Why Don’t You Allow Employees to use Wireshark? Read More »

, , ,
Scroll to Top