FundamentalsTools

802.11 Packet Capture Skillz To Pay The Bills

Digging deep into the Stefanick archives of real world 802.11 issues. I challenge YOU with 4 real world examples. Keep in mind sometimes the obvious is not so obvious. While frames don’t lie understanding 802.11 is important to see the truth. These are real customer issues on real networks with real …

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FundamentalsNews

30 Random Technical Thoughts by a WiFi Engineer

1) CRC is cyclic redundancy check. This means a radio received a frame and failed the checksum. A normal communication the intended receiver will not ACK and the sender will retransmit the frame. What’s important to understand when sniffing just because you have a high CRC rate in your sniffer window …

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Fundamentals

802.11 – Reason Codes and Status Codes

802.11 – Reason Codes and Status Codes  The 802.11 standard section 8.4 comments on reason codes and status codes. I’ve used these myself when troubleshooting frame captures. These codes provide insight to Wi-Fi related problems like stations connecting and disconnecting. Lets dive in and see what the standard says about reason and status code …

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FundamentalsNews

“Wi-Fi Doesn’t Stand For Anything. It Is Not An Acronym. There Is No Meaning.”

Let’s start 2016 with a blog post that will surely get some of you thinking. As a professional who focuses on Wi-Fi communication I’m asked from time to time what does Wi-Fi mean? The conversation usually goes something like this: What does Wi-Fi stand for? Is Wi-Fi an acronym for something? …

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News

802.11 – TIM and DTIM Information Elements

In this blog post I investigate 802.11 TIM and DTIM. Read the entire blog post here: http://community.arubanetworks.com/t5/Technology-Blog/802-11-TIM-and-DTIM-Information-Elements/ba-p/256997  Traffic Indication Map (TIM) –  After reviewing what the 802.11 standard says about TIM. Lets discuss in real world terms what a TIM is and how it works. You will specifically find TIM …

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News

Cisco 8.0 MR3 Beta Open To Public

Cisco announced public participation in 8.0 M3 beta testing. If you’re interested visit Cisco Support Community. https://supportforums.cisco.com/discussion/12755726/80mr3-beta-availability  8.0.122.x Available – 8.0MR3 Beta We are pleased to announce the availability of 80MR3 beta (Upcoming 8.0.130.0) for general testing If you are interested in participating on the beta program, please send email …

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Fundamentals

802.11 – Action Frames

The 802.11 standard section 8.5 comments on action frames. Action frames are interesting. Action frames can be triggered by access points or client stations. The action frame provides information and direction as in what to do. The 802.11 standard comments about action frames in 17 different sections of subsection 8.5. …

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News

Field Notice: FN – 64003 – AIR-ANT2568VG-N – Potential Moisture Intrusion to Radome – Replace Antenna

Important Cisco Field Notice for antenna AIR-ANT2568VG-N http://www.cisco.com/c/en/us/support/docs/field-notices/640/fn64003.html?emailclick=CNSemail  

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