How to setup a wireless access point
This material is work-in-progress ...
Do not follow instructions here until this notice is removed.
Install needed packages
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 the bridge by editing /etc/network/interfaces. Assuming that you wish to bridge the access point to the ethernet device eth0, you can add something like this:
auto br0 iface br0 inet dhcp hostname alpine bridge-ports eth0
Comment out any existing lines configuring eth0 as this should now be handled via the bridge configuration. It is not necessary to mention wlan0 here, as hostapd will take care of adding the device to the bridge later.
Please see Bridge for more information on network bridges.
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):
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.
Associate a few different clients to test.