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.

How To Observe if the Web Site you are Browsing Uses QUIC

Post Views: 2,064 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 […]

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3 Ways to put your Wi-Fi Interface in Monitor Mode in Linux

Post Views: 9,687 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

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Getting a Virtual Machine to Access Wi-Fi Monitor Mode

Post Views: 6,762 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

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CSI-HO-030 – Hands-On Understanding Security in WLAN/Wi-Fi Networks

Post Views: 11,901    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 20 students Course Description: Having a solid understanding of Network Security in WLAN/Wi-Fi networks is extremely important for

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CSI-HO-029 – Hands-On Security in IP Networks/Protocols

Post Views: 32,095 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: Having a good knowledge of Network Security in Wireless and TCP/IP networks is extremely important for anyone in the service

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CSI-SP-006 – Enhancing the Customer Broadband Experience

Post Views: 1,918 CellStream, Inc. – Telecom Consulting and Training!  1-Day Instructor Led Hands On Lab ClassAvailable in either Web Based delivery or On-Site DeliveryMinimum 10 students – Maximum 20 students What People are Saying About this Course: “I was very impressed with Andy Walding’s presentation of ‘Enhancing the Customer Broadband Experience’.  Andy’s knowledge and

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*FREE* – Fiber Optics Termination

Post Views: 12,297 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

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IPv4/IPv6 Path MTU (PMTU) Discovery Demystified

Post Views: 9,413 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

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Creating Delay to a Subnet Tech Tip

Post Views: 1,545 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,

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