[Voyage-linux] AP and IOS6

[Ingo Herz]

Ingo Herz <ingo at ...> writes:

> 
> Hi,
> I use voyage 0.8 with an ALIX.2D13 and a Wistron DNMA92 (AR9220, ath9).
> It is used as an access point, dsl router, dhcp/dns server and for some
> other little jobs.
> 
> All went fine until Apple came out with IOS6. These devices can connect
> to the access point, but after a short time of activity they disconnect
> and wifi has to be disabled/enabled on the client. The access point is
> running with the distributed hostapd with 801.11n enabled. If I disable
> 11n in hostapd's config all runs fine again. 11n is needed for a
> streaming client...
> 
> Looking into apple boards this seems to be a common problem with some
> APs since IOS6. I tried some other APs in the meantime - all went fine
> with these i* clients.
> 
> Is anyone out there running a similar config with working IOS6 devices
> in 801.11n? I wouldn't like to operate an additional AP, but I'm running
> out of ideas.
> 
> Any hints for fixing or debugging this annoying thing?
> 
> regards,
> Ingo
> 

Just for the files: I got it working again by adding the following to my
hostapd.conf:

wmm_enabled=1
wmm_ac_bk_cwmin=4
wmm_ac_bk_cwmax=10
wmm_ac_bk_aifs=7
wmm_ac_bk_txop_limit=0
wmm_ac_bk_acm=0
wmm_ac_be_aifs=3
wmm_ac_be_cwmin=4
wmm_ac_be_cwmax=10
wmm_ac_be_txop_limit=0
wmm_ac_be_acm=0
wmm_ac_vi_aifs=2
wmm_ac_vi_cwmin=3
wmm_ac_vi_cwmax=4
wmm_ac_vi_txop_limit=94
wmm_ac_vi_acm=0
wmm_ac_vo_aifs=2
wmm_ac_vo_cwmin=2
wmm_ac_vo_cwmax=3
wmm_ac_vo_txop_limit=47
wmm_ac_vo_acm=0
tx_queue_data3_aifs=7
tx_queue_data3_cwmin=15
tx_queue_data3_cwmax=1023
tx_queue_data3_burst=0
tx_queue_data2_aifs=3
tx_queue_data2_cwmin=15
tx_queue_data2_cwmax=63
tx_queue_data2_burst=0
tx_queue_data1_aifs=1
tx_queue_data1_cwmin=7
tx_queue_data1_cwmax=15
tx_queue_data1_burst=3.0
tx_queue_data0_aifs=1
tx_queue_data0_cwmin=3
tx_queue_data0_cwmax=7
tx_queue_data0_burst=1.5

I really don't understand why these QoS settings can have such an effect, but
all the iP* with IOS6/6.1 are happily surfing with my voyage router again :-)