Configuring WPA-PSK (TKIP) in Slackware

[ Friday, 8 August 2008, asperczwielun ]

This HOWTO describes the way to configure and manage a WPA-PSK (TKIP) connection between a HP 530 laptop running Slackware 12.1 and a Lantech router with a wireless access point. To get the encryption running, the wpa_supplicant package is required. Unfortunately, the stock package didn’t work correctly for me, which I worked around by building it from source, using SlackBuild.

The package consists of the following programs: the wpa_supplicant daemon, managing the wireless encryption, the wpa_passphrase program, generating pre-shared keys (PSK) and the wpa_cli program, setting up the connection and encryption parameters.

First, the access point needs to be configured on the router:

  • The configuration for WPA-PSK (TKIP) case reads as follows :
  • Slackware-12.1 configuration:

  • The /etc/rc.d/rc.local entries read as follows :
  • The newly created /etc/rc.d/rc.wifi_wpa executable script reads as follows:
  • The PSK value to be entered into above file can be obtained using the following command :
  • #wpa_passphrase ssid pre-key(passphrase)

    Where the SSID and the passphrase must match these entered into the access-point configuration.

  • The /etc/wpa_supplicant.conf entries read as follows :
  • The /etc/rc.d/rc.inet1.conf entries read as follows :

The commented out entries are related to a WEP-encrypted connection brought up using iwconfig and ifconfig commands.

The #iwconfig command yields :

The #iwlist auth command yields :

The #iwlist encryption command yields :

The network monitor shows the connection as follows :

Our network is also visible using the wpa_gui program (run as root):

The laptop utilizes a firewall of its own. The only downside to this type of connection is its initialization time, being around 20 seconds to 1 minute in my setup.

Translated-by : el es

About the Author

Andrzej Sperczyński

Fourty-nine years old computer science teacher. Linux user since 2002, Slackware user since version 9.1.

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