[FS#3475] 802.11r - Fast transitioning not working for 2nd SSID

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User who did this - buletti (buletti) 

Attached to Project - OpenWrt/LEDE Project
Summary - 802.11r - Fast transitioning not working for 2nd SSID
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - **Description**

I have 3 WIFI access points (2x Netgear WNDR4300, 1x Netgear WNDR3700v2) running 19.07.4 r11208-ce6496d796. Each of those APs has a 2.4 GHz and a 5 GHz band. For each of the 2 radios I have defined 2 SSIDs: Home-net and Guest-net.
So each AP has a total of 4 WIFI interfaces:
  * Home-net @ 2.4 GHz
  * Home-net @ 5 GHz
  * Guest-net @ 2.4 GHz
  * Guest-net @ 5 GHz

All the WIFI interfaces of the same SSID are bridged together into a separate VLAN.

802.11r is configured identically on all 4 WIFI interfaces. I'm using a very simple FT config that generates the keys locally based on the pre-shared key and I let most of the required settings to be generated automatically.

Now, my problem is that fast-transitioning works for the Home-net, but not for the Guest-net.
Home-net roaming is really working great and as expected. I can fast-transition between the radio cells of the same AP (2.4GHz  5GHz) as well as fast-transition between the cells of the different APs.

However fast-transitioning of the Guest-net on the other hand is not working at all. Even though it is essentially using the same configuration as the Home-net.
I already tried to provide explicit values for some of the relevant, generated 802.11r settings like NASID and Mobility-Domain, but that does not seem to make any difference.
I also did check what happens, if I delete the 2 working Home-net interfaces. Well, once they are deleted, the 2 remaining Guest-net interfaces started to work. I could then fast transition between the 2.4 and 5 GHz bands of the modified AP.
Given the fact that the previously defunct Guest-net started to function, I am kind of certain that my network configuration and 802.11r configuration are not the problem here.

**How to reproduce:**

//precondition//: a dual band AP with 19.07.04
1. for each of the 2 radios create 2 SSID pairs with the same name. 
2. enable hostapd debug mode for both radios
3. connect to the first SSID with a mobile device and try to roam between the 2 bands
4. check the system log for FT messages
//result//: FT is working for the first SSID
5. connect to the second SSID with a mobile device and try to roam between the 2 bands
6. check the system log for FT messages
//result//: FT is not working for the second SSID
//expected result//: FT is working for the second SSID


**wireless configuration**

config wifi-device 'radio0'
	option type 'mac80211'
	option hwmode '11g'
	option path 'platform/ar934x_wmac'
	option country 'DE'
	option legacy_rates '0'
	option htmode 'HT20'
	option log_level '1'
	option channel '11'
	option txpower '17'

config wifi-device 'radio1'
	option type 'mac80211'
	option hwmode '11a'
	option path 'pci0000:00/0000:00:00.0'
	option country 'DE'
	option legacy_rates '0'
	option htmode 'HT40'
	option log_level '1'
	option channel '36'    

## home-net 2.4 GHz
config wifi-iface 'default_radio0'
	option device 'radio0'
	option mode 'ap'
	option network 'WIFI-HOME'
	option encryption 'psk2+ccmp'
	option key '***redacted***'
	option ssid 'home-net'
	option macfilter 'allow'
	list maclist '***redacted***'
	option wpa_disable_eapol_key_retries '1'
	option ieee80211r '1'
	option ft_psk_generate_local '1'
	option ft_over_ds '0'
	option max_inactivity '30'

## home-net 5 GHz
config wifi-iface 'default_radio1'
	option device 'radio1'
	option mode 'ap'
	option network 'WIFI-HOME'
	option encryption 'psk2+ccmp'
	option key '***redacted***'
	option ssid 'home-net'
	option macfilter 'allow'
	list maclist '***redacted***'
	option wpa_disable_eapol_key_retries '1'
	option ieee80211r '1'
	option ft_psk_generate_local '1'
	option ft_over_ds '0'
	option max_inactivity '30'

## guest-net 2.4 GHz
config wifi-iface 'wifinet2'
	option device 'radio0'
	option mode 'ap'
	option network 'WIFI-GUEST'
	option encryption 'psk2+ccmp'
	option key '***redacted***'
	option ssid 'guest-net'
	option wpa_disable_eapol_key_retries '1'
	option ieee80211r '1'
	option ft_psk_generate_local '1'
	option ft_over_ds '0'
	option max_inactivity '30'

## guest-net 5 GHz
config wifi-iface 'wifinet3'
	option device 'radio1'
	option mode 'ap'
	option network 'WIFI-GUEST'
	option encryption 'psk2+ccmp'
	option key '***redacted***'
	option ssid 'guest-net'
	option wpa_disable_eapol_key_retries '1'
	option ieee80211r '1'
	option ft_psk_generate_local '1'
	option ft_over_ds '0'
	option max_inactivity '30'




   

 

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https://bugs.openwrt.org/index.php?do=details&task_id=3475

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