Troubleshooting • hostapd Wifi AP mode not working on Bullseye/Bookworm

Code:

root@machine2:/home/pi# systemctl status hostapd.service● hostapd.service - Access point and authentication server for Wi-Fi and Ethernet     Loaded: loaded (/lib/systemd/system/hostapd.service; enabled; preset: enabled)     Active: activating (auto-restart) (Result: exit-code) since Thu 2024-07-04 11:28:05 CEST; 628ms ago       Docs: man:hostapd(8)    Process: 2801 ExecStart=/usr/sbin/hostapd -B -P /run/hostapd.pid $DAEMON_OPTS ${DAEMON_CONF} (code=exited, status=1/FAILURE)        CPU: 23msJul 04 11:28:05 machine2 systemd[1]: Failed to start hostapd.service - Access point and authentication server for Wi-Fi and Ethernet.

Code:

root@machine2:/home/pi# /usr/sbin/hostapd -ddd /etc/hostapd/hostapd.confrandom: Trying to read entropy from /dev/randomConfiguration file: /etc/hostapd/hostapd.confdrv->ifindex=3l2_sock_recv==l2_sock_xmit=0x0x1437a30ioctl[SIOCSIWMODE]: Invalid argumentCould not set interface to mode(3)!Could not set interface to master mode!rtl871xdrv driver initialization failed.hostapd_interface_deinit_free(0x14366d8)hostapd_interface_deinit_free: num_bss=1 conf->num_bss=1hostapd_interface_deinit(0x14366d8)wlan0: interface state UNINITIALIZED->DISABLEDhostapd_bss_deinit: deinit bss wlan0wlan0: AP-DISABLEDhostapd_cleanup(hapd=0x1437320 (wlan0))hostapd_free_hapd_data: Interface wlan0 wasn't startedhostapd_interface_deinit_free: driver=(nil) drv_priv=(nil) -> hapd_deinithostapd_interface_free(0x14366d8)hostapd_interface_free: free hapd 0x1437320hostapd_cleanup_iface(0x14366d8)hostapd_cleanup_iface_partial(0x14366d8)hostapd_cleanup_iface: free iface=0x14366d8

Code:

# interfaces(5) file used by ifup(8) and ifdown(8)# Include files from /etc/network/interfaces.d:source /etc/network/interfaces.d/*auto loiface lo inet loopbackauto eth0iface eth0 inet static    address 192.168.0.127    netmask 255.255.255.0    gateway 192.168.0.1# WiFi APauto wlan0iface wlan0 inet static  address 172.16.0.1  netmask 255.255.255.0

Code:

interface=wlan0driver=rtl871xdrvssid=My_SSIDhw_mode=gchannel=1macaddr_acl=0auth_algs=1ignore_broadcast_ssid=0wpa=2wpa_passphrase=MYpwdwpa_key_mgmt=WPA-PSKwpa_pairwise=TKIPrsn_pairwise=CCMPmacaddr_acl=0

Code:

root@machine2:/home/pi# lsusbBus 001 Device 005: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter

Code:

root@machine2:/home/pi# iw listWiphy phy0        wiphy index: 0        max # scan SSIDs: 4        max scan IEs length: 2257 bytes        max # sched scan SSIDs: 0        max # match sets: 0        RTS threshold: 2347        Retry short limit: 7        Retry long limit: 4        Coverage class: 0 (up to 0m)        Device supports RSN-IBSS.        Supported Ciphers:                * WEP40 (00-0f-ac:1)                * WEP104 (00-0f-ac:5)                * TKIP (00-0f-ac:2)                * CCMP-128 (00-0f-ac:4)                * CCMP-256 (00-0f-ac:10)                * GCMP-128 (00-0f-ac:8)                * GCMP-256 (00-0f-ac:9)                * CMAC (00-0f-ac:6)                * CMAC-256 (00-0f-ac:13)                * GMAC-128 (00-0f-ac:11)                * GMAC-256 (00-0f-ac:12)        Available Antennas: TX 0 RX 0        Supported interface modes:                 * IBSS                 * managed                 * AP                 * AP/VLAN                 * monitor                 * mesh point                 * P2P-client                 * P2P-GO        Band 1:                Capabilities: 0x186e                        HT20/HT40                        SM Power Save disabled                        RX HT20 SGI                        RX HT40 SGI                        No RX STBC                        Max AMSDU length: 7935 bytes                        DSSS/CCK HT40                Maximum RX AMPDU length 65535 bytes (exponent: 0x003)                Minimum RX AMPDU time spacing: 16 usec (0x07)                HT Max RX data rate: 150 Mbps                HT TX/RX MCS rate indexes supported: 0-7, 32                Bitrates (non-HT):                        * 1.0 Mbps                        * 2.0 Mbps                        * 5.5 Mbps                        * 11.0 Mbps                        * 6.0 Mbps                        * 9.0 Mbps                        * 12.0 Mbps                        * 18.0 Mbps                        * 24.0 Mbps                        * 36.0 Mbps                        * 48.0 Mbps                        * 54.0 Mbps                Frequencies:                        * 2412 MHz [1] (20.0 dBm)                        * 2417 MHz [2] (20.0 dBm)                        * 2422 MHz [3] (20.0 dBm)                        * 2427 MHz [4] (20.0 dBm)                        * 2432 MHz [5] (20.0 dBm)                        * 2437 MHz [6] (20.0 dBm)                        * 2442 MHz [7] (20.0 dBm)                        * 2447 MHz [8] (20.0 dBm)                        * 2452 MHz [9] (20.0 dBm)                        * 2457 MHz [10] (20.0 dBm)                        * 2462 MHz [11] (20.0 dBm)                        * 2467 MHz [12] (20.0 dBm)                        * 2472 MHz [13] (20.0 dBm)                        * 2484 MHz [14] (disabled)        Supported commands:                 * new_interface                 * set_interface                 * new_key                 * start_ap                 * new_station                 * new_mpath                 * set_mesh_config                 * set_bss                 * authenticate                 * associate                 * deauthenticate                 * disassociate                 * join_ibss                 * join_mesh                 * remain_on_channel                 * set_tx_bitrate_mask                 * frame                 * frame_wait_cancel                 * set_wiphy_netns                 * set_channel                 * probe_client                 * set_noack_map                 * register_beacons                 * start_p2p_device                 * set_mcast_rate                 * connect                 * disconnect                 * set_qos_map                 * set_multicast_to_unicast        software interface modes (can always be added):                 * AP/VLAN                 * monitor        interface combinations are not supported        HT Capability overrides:                 * MCS: ff ff ff ff ff ff ff ff ff ff                 * maximum A-MSDU length                 * supported channel width                 * short GI for 40 MHz                 * max A-MPDU length exponent                 * min MPDU start spacing        Device supports TX status socket option.        Device supports HT-IBSS.        Device supports SAE with AUTHENTICATE command        Device supports low priority scan.        Device supports scan flush.        Device supports AP scan.        Device supports per-vif TX power setting        Driver supports full state transitions for AP/GO clients        Driver supports a userspace MPM        Device supports configuring vdev MAC-addr on create.        max # scan plans: 1        max scan plan interval: -1        max scan plan iterations: 0        Supported TX frame types:                 * IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0                 * managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0                 * AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0                 * AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0                 * mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0                 * P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0                 * P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0                 * P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0        Supported RX frame types:                 * IBSS: 0x40 0xb0 0xc0 0xd0                 * managed: 0x40 0xb0 0xd0                 * AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0                 * AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0                 * mesh point: 0xb0 0xc0 0xd0                 * P2P-client: 0x40 0xd0                 * P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0                 * P2P-device: 0x40 0xd0        Supported extended features:                * [ RRM ]: RRM                * [ FILS_STA ]: STA FILS (Fast Initial Link Setup)                * [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211                * [ TXQS ]: FQ-CoDel-enabled intermediate TXQs                * [ SCAN_RANDOM_SN ]: use random sequence numbers in scans                * [ SCAN_MIN_PREQ_CONTENT ]: use probe request with only rate IEs in scans                * [ CONTROL_PORT_NO_PREAUTH ]: disable pre-auth over nl80211 control port support                * [ DEL_IBSS_STA ]: deletion of IBSS station support                * [ SCAN_FREQ_KHZ ]: scan on kHz frequency support                * [ CONTROL_PORT_OVER_NL80211_TX_STATUS ]: tx status for nl80211 control port support