WiFi is down, what change did you make?

This weekend I got a call from an educational institute. The WiFi was down. They use an SDA fabric with a fabric-enabled Cisco 9800 WLC for their wireless. The incident occurred right after they made a change from DNAC to push new radius servers to the WLC. The problem was that no client station could […]

Wi-Fi Latency requirements

Voice calls require no more than 50% of airtime (PHY) to be used ( including voice calls) on the medium. It should in basics not exceed 50%. So why is that? Because the devices that do the voice call should be on and off the medium fast. If they need to wait it may exceed […]

What we need to know about the standard-power AP class

What we need to know about the standard-power AP class. Last time I wrote a small article about LPI (Low Powered Indoor) and one of the benefits the 6Ghz band brings to us. So what about the second type of device class type? SP (Standard Power) With LPI APs, it doesn’t matter what channels or […]

6Ghz benefits with Power Spectral Density

Wi-Fi 6e gives us a fresh low noisy floor and 24x 20mhz channels to play with in Europe. Currently, there are classes of Wi-Fi 6e Access Points (APs). There is “Standard Power” and Low Power Most APs that hit the market in Europe currently only support Low Power AKA LPI (Low Power Indoor). The change […]

CWAP – From the Physical to Data link layer.

I’m currently studying for my CWAP (Certified Wireless Analysis Professional exam.so I need to write something down otherwise it will fright my mind basically. The Mac and LLC header, inside the frame you can see both. Wireless works in the Physical and part in the data link layer ( it does the hand of their […]

Remote Spectrum analysis with Cisco

When there is a problem with a wireless client, and you have determined the coverage is good. A look into the spectrum to troubleshoot the layer 1 characteristics is a good start.This we do to rule out or find any interference on the spectrum. For that we use Chanalyzer. It comes with an accessory to […]

Awesome CWAP training

CWAP Training from Peter Mackenzie Himself, how nice to get this training from one of the most passionate wireless analysts that walks the earth :))

STA go to sleep and the AP tracking it, or not?

Recently my colleague asked me to join with a so called wireless problem involving a mac client, because I was a mac user and he was not. At the crime scene I observed a loading icon on the MacBook and I see his teams and outlook session disconnecting. The user tolt me he then click […]

Capacity problem or bad luck?

When I look at the specification room below, we see 130 people can sit in this room and 70 people during an exam. 70×2 devices (mobile phone and laptop) make 140 devices. Let’s do a capacity calculation But what If the 2,4Ghz was blasted away by a microwave that sitting just across the hallway of […]

Configure multiple BSSID

When you try to set up a second wireless network you propably gonnarun into this notification: ‘Dot11Radio0: Guest-ssid already existing on ssid STARGATE’ Of course you can set up a wireless network without guest-mode enable but keep in mind that the access point will not include the guest SSID in its beacon. So the client […]