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NixOS Networking

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1 Nov 2025
@crushing-smite:matrix.orgcrushing-smite

When I change either operatingChannelWidth from 20or40 to 80 or channel from 36 to 44 (both together, or just one of these), hostapd fails to start with the following log:

-- Boot ef950a87f7f14e2bb3fb920037886385 --
Nov 01 20:31:55 nixos systemd[1]: Starting IEEE 802.11 Host Access-Point Daemon...
Nov 01 20:31:55 nixos systemd[1]: Started IEEE 802.11 Host Access-Point Daemon.
Nov 01 20:31:55 nixos hostapd[796]: wlp5s0: interface state UNINITIALIZED->COUNTRY_UPDATE
Nov 01 20:31:55 nixos hostapd[796]: Interface initialization failed
Nov 01 20:31:55 nixos hostapd[796]: wlp5s0: interface state COUNTRY_UPDATE->DISABLED
Nov 01 20:31:55 nixos hostapd[796]: wlp5s0: AP-DISABLED
Nov 01 20:31:55 nixos hostapd[796]: wlp5s0: Unable to setup interface.
Nov 01 20:31:55 nixos hostapd[796]: wlp5s0: interface state DISABLED->DISABLED
Nov 01 20:31:55 nixos hostapd[796]: wlp5s0: AP-DISABLED
Nov 01 20:31:55 nixos hostapd[796]: wlp5s0: CTRL-EVENT-TERMINATING
Nov 01 20:31:55 nixos hostapd[796]: rmdir[ctrl_interface=/run/hostapd]: Device or resource busy
Nov 01 20:31:55 nixos hostapd[796]: hostapd_free_hapd_data: Interface wlp5s0 wasn't started
Nov 01 20:31:55 nixos hostapd[796]: nl80211: deinit ifname=wlp5s0 disabled_11b_rates=0
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Main process exited, code=exited, status=1/FAILURE
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Consumed 107ms CPU time, 3.9M memory peak, 2.2M read from disk.
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Scheduled restart job, restart counter is at 1.
Nov 01 20:31:56 nixos systemd[1]: Starting IEEE 802.11 Host Access-Point Daemon...
Nov 01 20:31:56 nixos systemd[1]: Started IEEE 802.11 Host Access-Point Daemon.
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: interface state UNINITIALIZED->COUNTRY_UPDATE
Nov 01 20:31:56 nixos hostapd[952]: Interface initialization failed
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: interface state COUNTRY_UPDATE->DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: AP-DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: Unable to setup interface.
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: interface state DISABLED->DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: AP-DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: CTRL-EVENT-TERMINATING
Nov 01 20:31:56 nixos hostapd[952]: rmdir[ctrl_interface=/run/hostapd]: Device or resource busy
Nov 01 20:31:56 nixos hostapd[952]: hostapd_free_hapd_data: Interface wlp5s0 wasn't started
Nov 01 20:31:56 nixos hostapd[952]: nl80211: deinit ifname=wlp5s0 disabled_11b_rates=0
Nov 01 20:31:56 nixos hostapd[952]: nl80211: Failed to remove interface wlp5s0 from bridge br0: Invalid argument
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Main process exited, code=exited, status=1/FAILURE
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Scheduled restart job, restart counter is at 2.
Nov 01 20:31:56 nixos systemd[1]: Starting IEEE 802.11 Host Access-Point Daemon...
Nov 01 20:31:56 nixos systemd[1]: Started IEEE 802.11 Host Access-Point Daemon.
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: interface state UNINITIALIZED->COUNTRY_UPDATE
Nov 01 20:31:56 nixos hostapd[952]: Interface initialization failed
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: interface state COUNTRY_UPDATE->DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: AP-DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: Unable to setup interface.
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: interface state DISABLED->DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: AP-DISABLED
Nov 01 20:31:56 nixos hostapd[952]: wlp5s0: CTRL-EVENT-TERMINATING
Nov 01 20:31:56 nixos hostapd[952]: rmdir[ctrl_interface=/run/hostapd]: Device or resource busy
Nov 01 20:31:56 nixos hostapd[952]: hostapd_free_hapd_data: Interface wlp5s0 wasn't started
Nov 01 20:31:56 nixos hostapd[952]: nl80211: deinit ifname=wlp5s0 disabled_11b_rates=0
Nov 01 20:31:56 nixos hostapd[952]: nl80211: Failed to remove interface wlp5s0 from bridge br0: Invalid argument
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Main process exited, code=exited, status=1/FAILURE
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 01 20:31:56 nixos systemd[1]: hostapd.service: Scheduled restart job, restart counter is at 2.
Nov 01 20:31:56 nixos systemd[1]: Starting IEEE 802.11 Host Access-Point Daemon...
Nov 01 20:31:56 nixos systemd[1]: Started IEEE 802.11 Host Access-Point Daemon.
Nov 01 20:31:56 nixos hostapd[968]: wlp5s0: interface state UNINITIALIZED->COUNTRY_UPDATE
Nov 01 20:31:56 nixos hostapd[968]: Interface initialization failed
Nov 01 20:31:56 nixos hostapd[968]: wlp5s0: interface state COUNTRY_UPDATE->DISABLED
Nov 01 20:31:56 nixos hostapd[968]: wlp5s0: AP-DISABLED
Nov 01 20:31:56 nixos hostapd[968]: wlp5s0: Unable to setup interface.
Nov 01 20:31:56 nixos hostapd[968]: wlp5s0: interface state DISABLED->DISABLED
Nov 01 20:31:56 nixos hostapd[968]: wlp5s0: AP-DISABLED
Nov 01 20:31:56 nixos hostapd[968]: wlp5s0: CTRL-EVENT-TERMINATING
Nov 01 20:31:56 nixos hostapd[968]: rmdir[ctrl_interface=/run/hostapd]: Device or resource busy
Nov 01 20:31:56 nixos hostapd[968]: hostapd_free_hapd_data: Interface wlp5s0 wasn't started
Nov 01 20:31:56 nixos hostapd[968]: nl80211: deinit ifname=wlp5s0 disabled_11b_rates=0
Nov 01 20:31:56 nixos hostapd[968]: nl80211: Failed to remove interface wlp5s0 from bridge br0: Invalid argument
Nov 01 20:31:57 nixos systemd[1]: hostapd.service: Main process exited, code=exited, status=1/FAILURE
Nov 01 20:31:57 nixos systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 01 20:31:57 nixos systemd[1]: hostapd.service: Scheduled restart job, restart counter is at 3.
Nov 01 20:31:57 nixos systemd[1]: Starting IEEE 802.11 Host Access-Point Daemon...
Nov 01 20:31:57 nixos systemd[1]: Started IEEE 802.11 Host Access-Point Daemon.
Nov 01 20:31:57 nixos hostapd[984]: wlp5s0: interface state UNINITIALIZED->COUNTRY_UPDATE
Nov 01 20:31:57 nixos hostapd[984]: Interface initialization failed
Nov 01 20:31:57 nixos hostapd[984]: wlp5s0: interface state COUNTRY_UPDATE->DISABLED
Nov 01 20:31:57 nixos hostapd[984]: wlp5s0: AP-DISABLED
Nov 01 20:31:57 nixos hostapd[984]: wlp5s0: Unable to setup interface.
Nov 01 20:31:57 nixos hostapd[984]: wlp5s0: interface state DISABLED->DISABLED
Nov 01 20:31:57 nixos hostapd[984]: wlp5s0: AP-DISABLED
Nov 01 20:31:57 nixos hostapd[984]: wlp5s0: CTRL-EVENT-TERMINATING
Nov 01 20:31:57 nixos hostapd[984]: rmdir[ctrl_interface=/run/hostapd]: Device or resource busy
Nov 01 20:31:57 nixos hostapd[984]: hostapd_free_hapd_data: Interface wlp5s0 wasn't started
Nov 01 20:31:57 nixos hostapd[984]: nl80211: deinit ifname=wlp5s0 disabled_11b_rates=0
Nov 01 20:31:57 nixos hostapd[984]: nl80211: Failed to remove interface wlp5s0 from bridge br0: Invalid argument
Nov 01 20:31:57 nixos systemd[1]: hostapd.service: Main process exited, code=exited, status=1/FAILURE
Nov 01 20:31:57 nixos systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 01 20:31:57 nixos systemd[1]: hostapd.service: Scheduled restart job, restart counter is at 4.
Nov 01 20:31:57 nixos systemd[1]: Starting IEEE 802.11 Host Access-Point Daemon...
Nov 01 20:31:57 nixos systemd[1]: Started IEEE 802.11 Host Access-Point Daemon.
Nov 01 20:31:57 nixos hostapd[999]: wlp5s0: interface state UNINITIALIZED->COUNTRY_UPDATE
Nov 01 20:31:57 nixos hostapd[999]: Interface initialization failed
Nov 01 20:31:57 nixos hostapd[999]: wlp5s0: interface state COUNTRY_UPDATE->DISABLED
Nov 01 20:31:57 nixos hostapd[999]: wlp5s0: AP-DISABLED
Nov 01 20:31:57 nixos hostapd[999]: wlp5s0: Unable to setup interface.
Nov 01 20:31:57 nixos hostapd[999]: wlp5s0: interface state DISABLED->DISABLED
Nov 01 20:31:57 nixos hostapd[999]: wlp5s0: AP-DISABLED
Nov 01 20:31:57 nixos hostapd[999]: wlp5s0: CTRL-EVENT-TERMINATING
Nov 01 20:31:57 nixos hostapd[999]: rmdir[ctrl_interface=/run/hostapd]: Device or resource busy
Nov 01 20:31:57 nixos hostapd[999]: hostapd_free_hapd_data: Interface wlp5s0 wasn't started
Nov 01 20:31:57 nixos hostapd[999]: nl80211: deinit ifname=wlp5s0 disabled_11b_rates=0
Nov 01 20:31:57 nixos hostapd[999]: nl80211: Failed to remove interface wlp5s0 from bridge br0: Invalid argument
Nov 01 20:31:58 nixos systemd[1]: hostapd.service: Main process exited, code=exited, status=1/FAILURE
Nov 01 20:31:58 nixos systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 01 20:31:58 nixos systemd[1]: hostapd.service: Scheduled restart job, restart counter is at 5.
Nov 01 20:31:58 nixos systemd[1]: hostapd.service: Start request repeated too quickly.
Nov 01 20:31:58 nixos systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 01 20:31:58 nixos systemd[1]: Failed to start IEEE 802.11 Host Access-Point Daemon.
20:46:03
@crushing-smite:matrix.orgcrushing-smiteThe br0 interface when hostapd fails to start also loses ability to provide wired internet connection20:46:55
@crushing-smite:matrix.orgcrushing-smite (I've changed everything authentication mode to wpa2-sha256 btw, so clients do work with it now) 20:47:47
@k900:0upti.meK900 What does iw phy say for it? 20:48:49
@crushing-smite:matrix.orgcrushing-smiteRight now, or when it fails?20:49:19
@k900:0upti.meK900Doesn't matter20:49:24

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