Wireshark: How to check if a Wi-Fi network supports 802.11v
Today’s exercice is simple: study the beacon frame and try to figure out what characteristics of the Wi-Fi network are advertised.
PRESENTATION OF IEEE 802.11V
IEEE 802.11v or BSS Transition is an amendment which was published in 2011 and added to the IEEE 802.11-2012 standards. The objective of this amendment was to develop extensions to the 802.11 MAC/PHY to provide network management for STAs including:
- L2 management of attached stations
- Monitoring the attached stations
- Configuring the attached stations
- Updating the attached stations
While the IEEE 802.11k amendment defined messages to retrieve information from the station, the ability to configure the station were not in its scope. So the 802.11v amendment is complementary to the 802.11k amendment.
BEACON OF A WI-FI NETWORK NOT SUPPORTING 802.11V
Looking at a Beacon frame in order to find 802.11v support, we need to focus on the Extended Capabilities Information Element number 127 and look at the 4th bit of the 3rd octet. This bit is most commonly named the “BSS Transition bit”.
CONFIGURATION OF 802.11V ON A CISCO WLC
In order to enable 802.11v on a WLAN profile on a Cisco WLC, you need to
- Navigate to the “WLAN” menu
- Select the WLAN profile you want to modify in order to open up the configuration view
- In the configuration view, select the “Advanced” tab
- Finally, in the advanced tab, under the “11v BSS Transition Support” section, select the “BSS Transition” option as shown in the image bellow:
BEACON OF A WI-FI NETWORK SUPPORTING 802.11V
Thank you for reading. In the next post, we will explain how to check if a Wi-Fi network is supporting 802.11k.
If you want learn how to check if a Wi-Fi network is supporting 802.11k, head over to this post: https://www.semfionetworks.com/blog/wireshark-how-to-check-if-a-wi-fi-network-supports-80211k