Below you may find a quick recipe to turn a computer running Linux equipped with an Atheros-based WiFi card into a WiFi access point with WPA2-PSK security.
It is a slightly modified configuration presented on Radek Karpowicz’s blog. In particular, I needed to add the line responsible for not caching MAC adresses (
brctl setageing br0 0) to achieve correct behavior. Without it the “AP” acted weird, i.e. for some time everything was working fine and then the WiFi-connected hosts couldn’t reach the rest of the network – the only solution (an unacceptable one of course in the longer perspective) was to ping any LAN address directly from the “AP”. I don’t know, maybe I don’t understand something, maybe I have misconfigured something or maybe it’s simply some error in hostapd or the madwifi drivers. All in all, I haven’t came across similar problems since adding that line to the script.
interface=ath0 bridge=br0 driver=madwifi # show verbose output logger_syslog=-1 logger_syslog_level=2 logger_stdout=-1 logger_stdout_level=2 debug=4 dump_file=/tmp/hostapd.dump ctrl_interface=/var/run/hostapd ctrl_interface_group=0 ssid=OurSSID eapol_key_index_workaround=0 eap_server=0 wpa=2 wpa_key_mgmt=WPA-PSK wpa_pairwise=CCMP wpa_passphrase=ourPreSharedKey
wlanconfig ath0 destroy wlanconfig ath0 create wlandev wifi0 wlanmode ap iwconfig ath0 channel channel_number brctl addbr br0 brctl addif br0 ath0 brctl addif br0 eth0 brctl setageing br0 0 ifconfig ath0 0.0.0.0 ifconfig eth0 0.0.0.0 ifconfig br0 IP_address hostapd hostapd.conf