Overview IOS-XE 17.1.X brought the concept of the redundancy management interface to the Cisco 9800 wireless controllers that we know from AireOS. Previously, connecting controllers back-to-back via their RPs was fool proof; this is still an option on the 9800s but is no longer best practice. This guide expects the use of IOS-XE 17.1.X or... Continue Reading →
Best Practice Cisco 9800 Configuration Method
Overview After many deployments, reading most of Cisco’s documentation, best practices, deployment guides, and after 150+ hours creating a tool to automate the deployment of Cisco 9800 Wireless Controllers to share with my team, I am sharing my thoughts about how these controllers *should* be configured. It should be mentioned that I use the GUI... Continue Reading →
Cisco 9800 802.1X/EAP User Authentication with Windows RADIUS (NPS)
This post covers the process of configuring Windows RADIUS (NPS), deploying a Wireless Profile using Group Policy (GPO) on Windows Server 2012 R2. There are many guides that follow each of these processes for the server-side process as well as on the Cisco 9800 controllers, but I found it difficult to find each of them... Continue Reading →
Wireless 802.1X Troubleshooting
How to troubleshoot wireless 802.1X/EAP authentication, starting from layer 1! PCAP Included.
802.11 Frame Exchanges
802.11 Frame Exchange processes: Association, Authentication, Four-Way Handshake, and more! PCAP included!
802.11 Frame Types and Formats
802.11 Frames by type: management, control, and data. PCAP included.
Spectrum Analysis – PHYs and Interferers
Identifying what's Wi-Fi and what is interference using spectrum analysis!
Wireless Collision Avoidance – CSMA/CA Though DCF/EDCF
The processes wireless devices follow to share access to the medium.
Power Save Methods
Wireless Power Save methods and how they have improved over time.
Cisco 9800 802.1x + EAP-TLS using Windows Server CA and NPS
How to deploy EAP-TLS via Microsoft Server 2012R2 configured as CA and NPS/RADIUS.
How I WI-FI 