How to setup a wireless access point
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Install needed packages
apk add hostapd wireless-tools wpa_supplicant
Check that card is detected
Cat /proc/net/dev and see which cards are detected. If no cards are available, check what driver the card uses and modprobe it. Check that the card is in master mode.
Setup Bridge
Please see Bridge for how to set up network bridges.
Setup Encryption
Edit /etc/hostapd/hostapd.wpa_psk and insert the following, replacing PASSPHRASE with the WPA_PSK key you would like to use (remove keys that you don't want to use):
00:00:00:00:00:00 PASSPHRASE
Setup hostapd
Edit /etc/hostapd/hostapd.conf and replace entries that need to be such as interface, bridge, driver, ssid, etc. Example file below:
interface=wlan0 bridge=br0 driver=hostap logger_syslog=-1 logger_syslog_level=2 logger_stdout=-1 logger_stdout_level=2 debug=0 dump_file=/tmp/hostapd.dump ctrl_interface=/var/run/hostapd ctrl_interface_group=0 ssid=SecureSSID #macaddr_acl=1 #accept_mac_file=/etc/hostapd/accept auth_algs=3 eapol_key_index_workaround=0 eap_server=0 wpa=3 wpa_psk_file=/etc/hostapd/hostapd.wpa_psk wpa_key_mgmt=WPA-PSK wpa_pairwise=CCMP
If you wish to use MAC address filtering, uncomment the lines starting with macaddr_acl and accept_mac_file, create /etc/hostapd/accept (with 600 permissions) and add the allowed clients' MAC address to the file.
Start hostapd.
/etc/init.d/hostapd start
Associate clients
Associate a few different clients to test.