<div dir="ltr">Full config is below. If I understand the documentation[1] correctly, then `hw_mode=g` implies the higher bands. But I must admit, it seems strange to me that I don't need to set `hw_mode=ac` or something like `hw_mode=g,n,ac`.<div><br></div><div>```</div><div><div>interface=wlp4s0</div><div>bssid=02:5c:f8:0d:26:40</div><div>#bridge=br0</div><div>driver=nl80211</div><div><br></div><div>logger_syslog=-1</div><div>logger_syslog_level=2</div><div>logger_stdout=-1</div><div>logger_stdout_level=2</div><div><br></div><div>ctrl_interface=/var/run/hostapd</div><div>ctrl_interface_group=0</div><div><br></div><div>ssid=test</div><div>hw_mode=g</div><div>channel=4</div><div>country_code=US</div><div>ieee80211d=1</div><div>ieee80211h=1</div><div><br></div><div>beacon_int=100</div><div>dtim_period=2</div><div>max_num_sta=255</div><div>rts_threshold=1024</div><div>fragm_threshold=256</div><div>preamble=1</div><div><br></div><div># Can't setup a second SSID since the wireles</div><div># card only supports a single SSID</div><div>#bss=wlan_0</div><div>#ssid=ntest</div><div><br></div><div>### WMM settings ###</div><div>wmm_enabled=1</div><div># Low priority / AC_BK = background</div><div>wmm_ac_bk_cwmin=4</div><div>wmm_ac_bk_cwmax=10</div><div>wmm_ac_bk_aifs=7</div><div>wmm_ac_bk_txop_limit=0</div><div>wmm_ac_bk_acm=0</div><div># Note: for IEEE 802.11b mode: cWmin=5 cWmax=10</div><div>#</div><div># Normal priority / AC_BE = best effort</div><div>wmm_ac_be_aifs=3</div><div>wmm_ac_be_cwmin=4</div><div>wmm_ac_be_cwmax=10</div><div>wmm_ac_be_txop_limit=0</div><div>wmm_ac_be_acm=0</div><div># Note: for IEEE 802.11b mode: cWmin=5 cWmax=7</div><div>#</div><div># High priority / AC_VI = video</div><div>wmm_ac_vi_aifs=2</div><div>wmm_ac_vi_cwmin=3</div><div>wmm_ac_vi_cwmax=4</div><div>wmm_ac_vi_txop_limit=94</div><div>wmm_ac_vi_acm=0</div><div># Note: for IEEE 802.11b mode: cWmin=4 cWmax=5 txop_limit=188</div><div>#</div><div># Highest priority / AC_VO = voice</div><div>wmm_ac_vo_aifs=2</div><div>wmm_ac_vo_cwmin=2</div><div>wmm_ac_vo_cwmax=3</div><div>wmm_ac_vo_txop_limit=47</div><div>wmm_ac_vo_acm=0</div><div># Note: for IEEE 802.11b mode: cWmin=3 cWmax=4 burst=102</div><div><br></div><div><br></div><div>### 802.11n settings ###</div><div>ieee80211n=1</div><div>ht_capab=[HT40+][SMPS-STATIC][SHORT-GI-20][SHORT-GI-40][TX-STBC][RX-STBC1][DSSS_CCK-40]</div><div>obss_interval=5</div><div><br></div><div>### 802.11ac settings ###</div><div>ieee80211ac=1</div><div>#vht_capab=[SHORT-GI-80]</div><div>#vht_capab=[TX-STBC-2BY1][SU-BEAMFORMEE]</div><div>vht_oper_chwidth=0</div><div>vht_oper_centr_freq_seg0_idx=42</div><div>vht_oper_centr_freq_seg1_idx=159</div><div><br></div><div>### WPA2-PSK settings ###</div><div>wpa=2</div><div>wpa_passphrase=some nice and long passphrase</div><div>wpa_pairwise=CCMP</div><div>peerkey=1</div><div><br></div><div>### Time settings ###</div><div>time_advertisement=2</div><div>time_zone=EST5</div></div><div>```</div><div><br></div><div>[1] -- <a href="http://w1.fi/cgit/hostap/tree/hostapd/hostapd.conf#n128">http://w1.fi/cgit/hostap/tree/hostapd/hostapd.conf#n128</a></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Oct 14, 2015 at 1:48 PM, Krishna Chaitanya <span dir="ltr"><<a href="mailto:chaitanya.mgit@gmail.com" target="_blank">chaitanya.mgit@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On Wed, Oct 14, 2015 at 11:04 PM, James Sumners <<a href="mailto:james.sumners@gmail.com">james.sumners@gmail.com</a>> wrote:<br>
><br>
> When I launch hostapd I see a line in the log that reads "hw vht capab:<br>
> 0x0, conf vht capab: 0x0". That is accurate because I currently have no<br>
> `vht_capab` line defined in my configuration. However, if I do an `iw<br>
> list` on my device then I see the following list of capabilities:<br>
><br>
> ```<br>
> VHT Capabilities (0x038071a0):<br>
> Max MPDU length: 3895<br>
> Supported Channel Width: neither 160 nor 80+80<br>
> short GI (80 MHz)<br>
> TX STBC<br>
> SU Beamformee<br>
> VHT RX MCS set:<br>
> 1 streams: MCS 0-9<br>
> 2 streams: MCS 0-9<br>
> 4 streams: not supported<br>
> ...<br>
> 8 streams: not supported<br>
> VHT RX highest supported: 0 Mbps<br>
> VHT TX MCS set:<br>
> 1 streams: MCS 0-9<br>
> 2 streams: MCS 0-9<br>
> 4 streams: not supported<br>
> ...<br>
> 8 streams: not supported<br>
> VHT TX highest supported: 0 Mbps<br>
> ```<br>
><br>
> When I set my hostapd config to have the line<br>
> `vht_capab=[SHORT-GI-80][TX-STBC-2BY1][SU-BEAMFORMEE]` then I get<br>
> an error that "SHORT-GI-80" is not supported. I can remove each<br>
> capability from the configuration directive and get the same sort of<br>
> result.<br>
><br>
> When I set `vht_oper_chwidth=1`, without setting `vht_capab`, then I<br>
> get an error:<br>
><br>
> ```<br>
> Mode: IEEE 802.11g Channel: 4 Frequency: 2427 MHz<br>
> DFS chan_idx seems wrong; num-ch: 13 ch-no: 36 conf-ch-no: 4 11n: 1<br>
> sec-ch: 0 vht-oper-width: 1<br>
> // list of channels available - [1, 13]<br>
> ```<br>
><br>
> If I set `vht_oper_chwidth=0`, still without `vht_capab` set, then I<br>
> get an error:<br>
><br>
> ```<br>
> Mode: IEEE 802.11g Channel: 4 Frequency: 2427 MHz<br>
> DFS 0 channels required radar detection<br>
> Could not set channel for kernel driver<br>
> ```<br>
><br>
> If I set `ieee80211ac=0` then hostapd starts up correctly (no other<br>
> changes to the configuration).<br>
><br>
> My card is an Intel 7260 that supports both AP and "AP/VLAN" modes with<br>
> one BSSID. I am using the nl80211 driver (i.e. `driver=nl80211` in<br>
> hostapd.conf).<br>
><br>
> Do you have any suggestions as to what could be wrong with my setup?<br>
><br>
</div></div>It looks like you are trying to use VHT in 2.4GHz.<br>
Can you past the full config? is your hw_mode set to a to use VHT?<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>James Sumners<br><a href="http://james.sumners.info/" target="_blank">http://james.sumners.info/</a> (technical profile)</div><div><a href="http://jrfom.com/" target="_blank">http://jrfom.com/</a> (personal site)</div><div><a href="http://haplo.bandcamp.com/" target="_blank">http://haplo.bandcamp.com/</a> (band page)</div></div></div></div></div>
</div>