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THIS DOESN'T WORK

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Use hostapd for the master, and wpa_supplicant with the client.

The (currently latest) release voyage-0.2pre1 comes with a madwifi driver with broken WPA support:
Multicast-Keys are not exchanged correctly; thus ARP does not work.
This patch to the kernel madwifi driver works:
   http://sourceforge.net/mailarchive/forum.php?thread_id=7938437&forum_id=33966 

In the CVS HEAD of Madwifi this problem has been fixed (http://cvs.sourceforge.net/viewcvs.py/madwifi/madwifi/net80211/ieee80211_wireless.c?rev=1.27&view=log)

(While searching for the problem, I updated hostapd and wpa_supplicant to the newest version. I think the original tools form voyage-0.2pre1 also work. If they do, please delete this line.)

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My client configuration:\\
voyage2:/etc# cat wpa_supplicant.conf\\
ctrl_interface=/var/run/wpa_supplicant\\
eapol_version=2\\
ap_scan=1\\
network={
  ssid="myssid"
  #scan_ssid=1
  scan_ssid=0
  priority=5
  proto=WPA
  key_mgmt=WPA-PSK
  #pairwise=CCMP TKIP
  pairwise=CCMP
  #group=CCMP TKIP WEP104 WEP40
  group=CCMP
  #psk="oB1ejouzTheeg5eiaiGhah6ePieh0iquAgh6iemuAepae9seZohqu4aeHenah5c"
  psk=c22c1e6febc7875af85d033bbf15f5ca836633bac8eb16693fd58bff66fcb66c
}

Cave: The key belongs to the ssid. It's generated with the shell command:
  wpa_passphrase myssid mypassphrase

--

My master (AP) configuration:\\
voyage:/etc/hostapd# grep -v ^# hostapd.conf|grep -v ^$\\
interface=ath0\\
driver=madwifi\\
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=myssid\\
macaddr_acl=0\\
auth_algs=3\\
eap_authenticator=0\\
wpa=1\\
wpa_psk=c22c1e6febc7875af85d033bbf15f5ca836633bac8eb16693fd58bff66fcb66c\\
wpa_key_mgmt=WPA-PSK\\
wpa_pairwise=CCMP\\
wpa_group_rekey=600\\
wpa_gmk_rekey=86400\\

====Links====

https://wiki.ubuntu.com/WPAHowto