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Arcom Embedded Linux Technical Manual Configuring AEL

Wireless network configuration

Wireless support under AEL has been tested using a Linksys Wireless CompactFlash

Card (model WCF12). This card is based on the popular PRISM chip set and any

PRISM2, 2.5 or 3 based card should work. Cards based on other chip sets may or may

not work.

This section explains how to configure wireless networking (WLAN) to access a network

via a wireless access point under AEL. For further details, see the Wireless Tools for

Linux website at www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html

and the

Host AP (the card drivers) website at hostap.epitest.fi/

Configuring the wireless network device

In order to connect to a wireless network, you must obtain the following settings from

your network administrator:

ESSID network identifier, for example "ABC-Wireless-Network". •

•

Radio channel to use (1-14, depending on local legislation and access point

configuration).

Shared keys used by your access point, if your access point is configured to use

Wired Equivalent Privacy (WEP) encryption.

Configuration is carried out with extra options in /etc/network/interfaces in the

appropriate iface stanza for the WLAN device (usually wlan0), as described in the

previous section. The more common options are listed in the table below.

Option Description

wireless_mode MODE Sets the operating mode of the device. Common values for

MODE are:

Adhoc. A network composed of only one cell and without

an access point.

Managed. Node connects to a network composed of

many access points.

wireless_essid ESSID Sets the ESSID (network name).

wireless_channel CHAN Specifies the radio channel (1-14) to use.

wireless_enc ENC

Sets the level of encryption to use. ENC may be one of:

•

Off. No encryption.

Open. Encryption is used if available but non-encrypted

connections are permitted.

Restricted. Encryption is required.

wireless_keyN KEY Sets each of the four encryption keys. N is 1-4 and indicates

which of the keys to set. KEY is the encryption key

composed of either 5 bytes (for 64-bit WEP) or 13 bytes (for

128-bit WEP) as hexadecimal digits.

wireless_defaultkey N Uses key N (1-4) as the default key.

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