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Showing posts from November, 2017

Using Bluetooth to Debunk the Dual 5 GHz Myth

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What does Bluetooth have to do with 5 GHz Wi-Fi?  Nothing.  Bluetooth operates in the 2.4 GHz frequency band.

If you look in the right spot, however, Bluetooth can teach you something about 5 GHz Wi-Fi.  Specifically, the Bluetooth 5.0 specification can teach you that Dual 5 GHz access points are a bad idea.

This blog's opposition to Dual 5 GHz access points (APs) is not news to long time readers.  The 'Two Radios Are Better Than One (Unless They're Both 5 GHz)' blog post, which details how Dual 5 GHz APs (like Cisco 3800 Series APs, for example) make enterprise Wi-Fi less stable, is nearly three years old. 

Today's re-stating of the pitfalls of dual 5 GHz radio APs is due to something I uncovered while reading about Bluetooth.  I was reading the Bluetooth 5.0 specification in search of anything that might affect Wi-Fi when I happened upon this table:


The middle rows of the table is most dramatic, showing that out-of-band RF activity can interfere with the 2.4 GHz b…

How to Fix a Cisco Wi-Fi Network Without Surveying, Adding APs or Moving APs

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The vast majority of Cisco Wi-Fi networks can be fixed without having to spend precious time and money on surveying, adding new access points (APs) or moving existing APs.  Here's how.

Cisco has some very fine enterprise Wi-Fi products.  Unfortunately, those very fine products often get deployed in a manner that leads to connectivity and performance issues.

The following steps take about ten minutes to perform, and will stabilize connectivity and performance for the vast majority of enterprise-class Cisco Wi-Fi networks.  Anything in bold is something to click or select or check or uncheck or type.

1. Access the Cisco wireless LAN controller (WLC) interface via a web browser.

2. Navigate to WLANs (menu) -> -> Security (tab) -> Uncheck WPA Policy -> Apply

NOTE: Wi-Fi Protected Access (WPA) is a Wi-Fi security method that uses temporal key integrity protocol (TKIP) encryption by default.  Using TKIP encryption disables 802.11n and 802.11ac data rates, effectively renderin…