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 Contention Mechanisms
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.
