Hi, I'm attempting to get ACS working to see how it behaves. Unfortunately I can't get it working. Release version: https://w1.fi/releases/hostapd-2.4.tar.gz Only differences in hostapd.conf: logger_stdout_level=0 ap_max_inactivity=10 ieee80211n=1 channel=0 Only differences in defconfig: CONFIG_LIBNL32=y CONFIG_IEEE80211N=y CONFIG_IEEE80211AC=y (should have turned that off - unused) CONFIG_ACS=y Using ath9k driver, with message on bootup: [ 1.891393] ath9k 0000:01:00.0: enabling device (0140 -> 0142) [ 2.018054] ieee80211 phy0: Atheros AR9300 Rev:3 mem=0xf0980000, irq=171 I turned on ACS, expecting it to automatically select the best of the 1-11 channels on 2.4GHz in 802.11n mode. Starting up hostapd with -dd: Starting HOSTAP Daemon: 1493191720.536396: random: Trying to read entropy from /dev/random 1493191720.536549: Configuration file: /etc/hostapd.conf 1493191720.538374: ctrl_interface_group=0 1493191720.540665: rfkill: initial event: idx=0 type=1 op=0 soft=0 hard=0 1493191720.54115[ 4.420957] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready 3: nl80211: TDLS supported 1493191720.541183: nl80211: TDLS external setup 1493191720.541209: nl80211: Supported cipher 00-0f-ac:1 1493191720.541230: nl80211: Supported cipher 00-0f-ac:5 1493191720.541248: nl80211: Supported cipher 00-0f-ac:2 1493191720.541264: nl80211: Supported cipher 00-0f-ac:4 1493191720.541280: nl80211: Supported cipher 00-0f-ac:10 1493191720.541296: nl80211: Supported cipher 00-0f-ac:8 1493191720.541311: nl80211: Supported cipher 00-0f-ac:9 1493191720.541326: nl80211: Supported cipher 00-0f-ac:6 1493191720.541342: nl80211: Supported cipher 00-0f-ac:13 1493191720.541357: nl80211: Supported cipher 00-0f-ac:11 1493191720.541373: nl80211: Supported cipher 00-0f-ac:12 1493191720.541550: nl80211: Using driver-based off-channel TX 1493191720.541619: nl80211: Use separate P2P group interface (driver advertised support) 1493191720.541639: nl80211: interface wlan0 in phy phy0 1493191720.541718: nl80211: Set mode ifindex 3 iftype 3 (AP) 1493191720.541788: nl80211: Setup AP(wlan0) - device_ap_sme=0 use_monitor=0 1493191720.541908: nl80211: Subscribe to mgmt frames with AP handle 0xad850 1493191720.541935: nl80211: Register frame type=0xb0 (WLAN_FC_STYPE_AUTH) nl_handle=0xad850 match= 1493191720.542004: nl80211: Register frame type=0x0 (WLAN_FC_STYPE_ASSOC_REQ) nl_handle=0xad850 match= 1493191720.542067: nl80211: Register frame type=0x20 (WLAN_FC_STYPE_REASSOC_REQ) nl_handle=0xad850 match= 1493191720.542129: nl80211: Register frame type=0xa0 (WLAN_FC_STYPE_DISASSOC) nl_handle=0xad850 match= 1493191720.542189: nl80211: Register frame type=0xc0 (WLAN_FC_STYPE_DEAUTH) nl_handle=0xad850 match= 1493191720.542248: nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0xad850 match= 1493191720.542309: nl80211: Register frame type=0x40 (WLAN_FC_STYPE_PROBE_REQ) nl_handle=0xad850 match= 1493191720.565668: nl80211: Add own interface ifindex 3 1493191720.565707: nl80211: if_indices[16]: 3 1493191720.565754: phy: phy0 1493191720.565776: BSS count 1, BSSID mask 00:00:00:00:00:00 (0 bits) 1493191720.566559: nl80211: Regulatory information - country=00 1493191720.566591: nl80211: 2402-2472 @ 40 MHz 20 mBm 1493191720.566616: nl80211: 2457-2482 @ 40 MHz 20 mBm (no IR) 1493191720.566639: nl80211: 2474-2494 @ 20 MHz 20 mBm (no OFDM) (no IR) 1493191720.566661: nl80211: 5170-5250 @ 160 MHz 20 mBm (no IR) 1493191720.566682: nl80211: 5250-5330 @ 160 MHz 20 mBm (DFS) (no IR) 1493191720.566704: nl80211: 5490-5730 @ 160 MHz 20 mBm (DFS) (no IR) 1493191720.566726: nl80211: 5735-5835 @ 80 MHz 20 mBm (no IR) 1493191720.566747: nl80211: 57240-63720 @ 2160 MHz 0 mBm 1493191720.566819: nl80211: Added 802.11b mode based on 802.11g information 1493191720.566840: Allowed channel: mode=1 chan=1 freq=2412 MHz max_tx_power=20 dBm 1493191720.566859: Allowed channel: mode=1 chan=2 freq=2417 MHz max_tx_power=20 dBm 1493191720.566877: Allowed channel: mode=1 chan=3 freq=2422 MHz max_tx_power=20 dBm 1493191720.566894: Allowed channel: mode=1 chan=4 freq=2427 MHz max_tx_power=20 dBm 1493191720.566910: Allowed channel: mode=1 chan=5 freq=2432 MHz max_tx_power=20 dBm 1493191720.566927: Allowed channel: mode=1 chan=6 freq=2437 MHz max_tx_power=20 dBm 1493191720.566944: Allowed channel: mode=1 chan=7 freq=2442 MHz max_tx_power=20 dBm 1493191720.566960: Allowed channel: mode=1 chan=8 freq=2447 MHz max_tx_power=20 dBm 1493191720.566977: Allowed channel: mode=1 chan=9 freq=2452 MHz max_tx_power=20 dBm 1493191720.566994: Allowed channel: mode=1 chan=10 freq=2457 MHz max_tx_power=20 dBm 1493191720.567010: Allowed channel: mode=1 chan=11 freq=2462 MHz max_tx_power=20 dBm 1493191720.567028: Allowed channel: mode=0 chan=1 freq=2412 MHz max_tx_power=20 dBm 1493191720.567045: Allowed channel: mode=0 chan=2 freq=2417 MHz max_tx_power=20 dBm 1493191720.567062: Allowed channel: mode=0 chan=3 freq=2422 MHz max_tx_power=20 dBm 1493191720.567078: Allowed channel: mode=0 chan=4 freq=2427 MHz max_tx_power=20 dBm 1493191720.567095: Allowed channel: mode=0 chan=5 freq=2432 MHz max_tx_power=20 dBm 1493191720.567112: Allowed channel: mode=0 chan=6 freq=2437 MHz max_tx_power=20 dBm 1493191720.567128: Allowed channel: mode=0 chan=7 freq=2442 MHz max_tx_power=20 dBm 1493191720.900419: Allowed channel: mode=0 chan=8 freq=2447 MHz max_tx_power=20 dBm 1493191720.900452: Allowed channel: mode=0 chan=9 freq=2452 MHz max_tx_power=20 dBm 1493191720.900471: Allowed channel: mode=0 chan=10 freq=2457 MHz max_tx_power=20 dBm 1493191720.900489: Allowed channel: mode=0 chan=11 freq=2462 MHz max_tx_power=20 dBm 1493191720.900508: ACS: Automatic channel selection started, this may take a bit 1493191720.900527: ACS: Scanning 1 / 5 1493191720.900552: wlan0: nl80211: scan request 1493191720.900584: nl80211: Scan frequency 2412 MHz 1493191720.900601: nl80211: Scan frequency 2417 MHz 1493191720.900616: nl80211: Scan frequency 2422 MHz 1493191720.900630: nl80211: Scan frequency 2427 MHz 1493191720.900644: nl80211: Scan frequency 2432 MHz 1493191720.900659: nl80211: Scan frequency 2437 MHz 1493191720.900673: nl80211: Scan frequency 2442 MHz 1493191720.900687: nl80211: Scan frequency 2447 MHz 1493191720.900701: nl80211: Scan frequency 2452 MHz 1493191720.900714: nl80211: Scan frequency 2457 MHz 1493191720.900728: nl80211: Scan frequency 2462 MHz 1493191720.912015: Scan requested (ret=0) - scan timeout 10 seconds 1493191720.912068: wlan0: interface state UNINITIALIZED->ACS 1493191720.912107: wlan0: ACS-STARTED 1493191720.912134: Interface initialization will be completed in a callback (ACS) 1493191720.912159: ctrl_iface not configured! hostapd. <--------- this indicates the end of hostapd output [ 10.971004] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready So hostapd does work and provide an AP, but it's not on an automatic channel, and it's seems to always pick channel 1 regardless of how crowded it is with other devices. My understanding is that it should output some ACS scan info at the end, but it's not. Any ideas why ACS would not be working? I have been reading the ACS documentation (and the comments in the hostapd.conf), and haven't worked out how it does behave yet. Does it only scan once on startup? Or does it scan periodically while operation, and jump channels when it sees fit? Many thanks, Sam _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
