Software Manual

WE865-DUAL Software User Guide

1vv0300788 Rev. 0 08/08/08

iwconfig eth0 sens 2

retry

Most cards have MAC retransmissions, and some allow setting the behaviour of the retry

mechanism.

To set the maximum number of retries, enter limit `value'. This is an absolute value (without

unit). To set the maximum length of time the MAC should retry, enter lifetime `value'. By

defaults, this value in seconds, append the suffix m or u to specify values in milliseconds or

microseconds.

You can also add the min and max modifiers. If the card supports automatic mode, they

define the bounds of the limit or life-time. Some other cards define different values depending

on packet size, for example in 802.11 min limit is the short retry limit (non RTS/CTS packets).

Examples:

iwconfig eth0 retry 16

iwconfig eth0 retry lifetime 300m

iwconfig eth0 retry min limit 8

rts[_threshold]

RTS/CTS adds a handshake before each packet transmission to make sure that the channel

is clear. This adds overhead, but increases performance in case of hidden nodes or a large

number of active nodes. This parameter sets the size of the smallest packet for which the

node sends RTS; a value equal to the maximum packet size disables the mechanism. You

may also set this parameter to auto, fixed or off.

Examples:

iwconfig eth0 rts 250

iwconfig eth0 rts off

frag[mentation_threshold]

Fragmentation allows splitting an IP packet in a burst of smaller fragments transmitted on the

medium. In most cases this adds overhead, but in a very noisy environment this reduces the

error penalty and allows packets to get through interference bursts.

This parameter sets the maximum fragment size which is always lower than the maximum

packet size.

This parameter may also control Frame Bursting available on some cards, the ability to send

multiple IP packets together. This mechanism would be enabled if the fragment size is larger

than the maximum packet size.

You may also set this parameter to auto, fixed or off.

Examples:

iwconfig eth0 frag 512

iwconfig eth0 frag off

key/enc[ryption]

Used to manipulate encryption or scrambling keys and security mode.