{{parent page="Linux"}}

===Wireless network on Linux (with WPA encryption)===
Platform: CentOS 5.2
Kernel: 2.6.27.6

==Tools you will need==
iwconfig: http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html
WPA_supplicant: http://hostap.epitest.fi/wpa_supplicant/

==Scan usable ssid==
I got 20 ssid. Here is the one I'd like to connect to -
%%
> iwlist eth1 scanning
Cell 01 - Address: 00:1E:8C:59:EE:21
ESSID:"apop.wifi"
Protocol:IEEE 802.11bg
Mode:Master
Frequency:2.412 GHz (Channel 1)
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Quality=96/100 Signal level=-29 dBm
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : PSK
Extra: Last beacon: 43ms ago
%%

==Setup wireless interface==
eth1 = my interface name
essid apop.wiki = my ssid
key open s:xxxx [1] = use open key, ascii password xxxx, key index 1
mode Managed = there are Managed and Ad-hoc
freq 2.412G = what iwlist shows
channel 1 = what iwlist shows
rate 54M = my speed
ap <mac> = my wireless router's id
%%
iwconfig eth1 essid apop.wifi key open s:xxxxx [1] mode Managed freq 2.412G channel 1 rate 54M ap 00:1E:8C:59:EE:21
%%

==Activate WPA supplicant==
Install WPA_Supplicant if not already.
%%
tar zxvf wpa_supplicant-0.5.10.tar.gz
cd wpa_supplicant-0.5.10
mv configdef .config
edit .config (I enabled ssl on /usr/local)
make && make install
%%

Create a config file
%%(text;wpa_supplicant.conf)
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel

ap_scan=1
fast_reauth=1
eapol_version=1

network={
ssid="apop.wifi"
bssid=00:1E:8C:59:EE:21
mode=0 # managed
frequency=2412
proto=WPA
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
psk="xxx"
priority=2 # 2 > default = 0
}
%%

Start wpa_supplicant
%%
wpa_supplicant -Dwext -ieth1 -c /etc/wpa_supplicant/wpa_supplicant.conf
%%

==Assign IP to interface==
This you should know already...