Hi, We have a problem with hostapd and 80211N. We wanted to set up an accesspoint using hostapd. When we set the require_ht setting int he hostapd.conf our client gets rejected. If we do not set it, we can connect, but only get legacy data rates. So I did a bit of digging (mainly debug output and wireshark). My test client here is my laptop with an "Intel Corporation Wireless 7260 (rev bb)" wifi card. I am using an up to date install of archlinux. I have done this test with default kernel (4.8) and lts (4.4). It should not be relevant though, we had the same problems on different devices. I found out that the probe frames are sent with the HT-capability info, but the actual assoc (and auth) request frames lack these fields. Looking at the code the code, hostapd checks whether the station supports HT when it adds it. This is done only when the first association request is sent. Which doesn't contain the HT information, which explains why we get rejected with require_ht. I have attached hexdumps (from wireshark) for the mentioned packages and our hostapd.conf The relevant parts in the code I found are: src/ap/ieee802_11.c:1858+ src/ap/ieee802_11_ht.c:335+ ongy PS. We had the same problem on hostapd 2.4 and 2.6 (debian stretch/arch)
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assoc.dump
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auth.dump
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interface=wlp0s29u1u8 driver=nl80211 hw_mode=g channel=6 ieee80211d=1 # limit the frequencies used to those allowed country_code=DE ieee80211n=1 # 802.11n support ht_capab=[HT40+][SHORT-GI-40][DSSS_CK-40] ssid=ongy5 auth_algs=1 # 1=wpa, 2=wep, 3=both wpa=1 # WPA2 only wpa_key_mgmt=WPA-PSK rsn_pairwise=CCMP wpa_passphrase=<censored> ap_max_inactivity=3000 skip_inactivity_poll=0 logger_syslog_level=3 require_ht=1 wmm_enabled=1 # QoS support
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probe.dump
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