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Zero-to-Hero on Wireshark Columns
When you first start using Wireshark you will find that the great folks at Wireshark provide us with a “Default” profile. This is where we all started. We will call this our Zero starting point. Here is what it looks like: That default, whilst a great starting point leaves much to be desired as your
CSI-HO-036 – L1, L2, and L3 Networking Protocols – 3 Day Hands On Lab Course
CellStream, Inc. – Telecom Consulting and Training! 3-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 applicable
Find and Display All Your Wi-Fi Passwords in Windows
If you have been to one of my Wireshark or Wi-Fi classes then you know I often criticize Microsoft Windows for some of its – well – inexplicable approaches to usage and security. Here is yet another example. Let’s say someone has a Rubber Ducky, or some Arduino device, that they want to plug into
Troubleshooting Your Network Using Port Mirroring and Packet Capture
Scenario Let’s say you have a DHCP server running on a Cisco Switch that is behaving strangely and you want to examine the traffic over a couple of hours while not creating a gigantic unmanageable capture file. A note here: I am doing this on a Cisco switch, but most all vendor switches support this
Troubleshooting The Internet Using Ping (a.k.a. ICMP)
In this article, I wanted to provide a guide to using ping – ICMP Echo – to troubleshoot your network. Most people use ping on their platform to test if they can reach a given destination. Just open up a terminal (Linux or MAC OSx) or command line (Windows: Start> Run> cmd) and enter the
BGP Autonomous System (AS) Numbers
In a recent class I was asked for some details on BGP Autonomous System (AS or ASN) Numbers. I thought I would document and provide a more complete answer here for others to learn from as well. What is the AS Number? Let’s begin with a definition. An Autonomous System Number (AS number or simply
