802.11r not working

Dennis Bland dennis at dbperformance.com
Tue Sep 22 23:42:09 EDT 2020

The best way to debug 802.11r is to capture 802.11 management frames
with Wireshark, typically using a Linux laptop with Wi-Fi hardware in
monitor mode.  Then you can confirm what AP your smartphone is really
trying to contact over the air.

You said your KVM-based router is running OpenWrt, but not hostapd.
What is it using instead of hostapd?  You realize this is a hostapd
forum, right?

From: Michael T Farnworth <michael at turf.org>
To: hostap at lists.infradead.org
Subject: 802.11r not working
Message-ID: <b1476587-21f3-3c58-757e-06da5b3ca3a2 at turf.org>
Content-Type: text/plain; charset=utf-8; format=flowed

I have 8 "boxes" running the latest snapshot of OpenWrt.  7 of these are
typical router boxes with WiFi hardware (Archer C7 v2, Archer A7 v5,
Armor z2) and the remaining one is virtual and runs under KVM on a server.

I didn't think 802.11r was working so I ran a tcpdump on all 8 devices
and it appears that my Samsung Galaxy S9 is sending the 802.11r ethernet
890d frames to the MAC Address of the KVM based router, which as it has
no WiFi hardware couldn't have been the original associating WiFi point
and obviously isn't running hostapd.  Obviously no response is ever
given to any of these packets as a consequence.

The KVM based router is running the radius server, does anybody have any
thoughts on why this is happening?  I really don't understand why my
phone is looking in the wrong place for a response!


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