| -d dr_opts |
This switch allows for the user
to specify a specific data rate, thus removing it from the available
variations of the experiment. "dr_opts" is the data rate the user
wants to use. If -d is not given on the command line, the default
array of data rates is varied over. Initially these defaults are
1, 2, 5.5 and 11 Mbps. This can be customized for more protocol
relevant settings by editing the script and changing the "@dr"
list. If -d is specified, the following value (dr_opts) can take two forms, either 'a' which selects a single default data rate (initially 1 Mbps), or the user can give the data rate. If a specific data rate is specified, the suffixes 'M' and 'K' are understood, but there must be no whitespace between the number and the suffix. |
| -m |
This switch specifies that the
user desires to be in "mobile" mode. The intended use is for the
situation where the user has two laptops and can vary the distance
freely. If this switch is not given, wtest.pl defaults to
"server" mode, where it tests a list of wireless links, specified by
@remote_wifi_ip. |
| -p pwr_opts |
The -p switch allows for the
user to specify the script's behavior in terms of power settings.
If the switch is not given, the default behavior is to simply use a
single power value and to not vary transmit power settings. (The
reason for choosing this default is because not all wireless cards
actually respond to setting the transmit power.) If -p is specified, "pwr_opts" can take two forms: 1. nothing, 2. a specific setting. If nothing is given for "pwr_opts", the script varies the power based on a default list of power settings. The second option is to specify a power setting. This second option can take four forms , a number corresponding to the dBm setting, a direct power (e.g. "30mW" - notice no spaces), "auto" or "on"/"off". (see txpower section of the iwconfig man page) |
| -rtx rtx_opts |
This switch specifies how the
script should handle retries. There are three modes for operation
with this switch specified, depending on the value of rtx_opts.
If rtx_opts is not specified, the behavior of wtest.pl is to vary the
maximum number of retries based on an internal list of values. If
rtx_opts is specified as 'a', then the behavior is the auto mode, where
one value (4 by default) is chosen for the maximum number of
retires. Alternatively, the user can specify a number for
rtx_opts and that will be the maximum number of retries for each
transmission. |
| -R rts_opts |
The -R option specifies the
script's usage of RTS/CTS. If -R is not specified, the default
behavior is to turn off RTS/CTS usage. If rts_opts is not
specified, the script varies RTS/CTS behavior between 250 and off,
where 250 specifies 250 B as the smallest packet for which RTS/CTS will
be used. (see man iwconfig) The valid options a user can
specify for rts_opts are 'y' and 'n', which correspond to turning
RTS/CTS on or off, respectively. |
| -s pkt_size_opts |
-s Is used by the script to
determine its behavior in terms of the packet size(s) it will
use. The default behavior, without using this switch or using the
switch but not specifying pkt_size_opts, is to vary packet sizes
between 500, 1000, 1500 and 2000 B. Alternatively, a user may
give 'a' or a numerical packet size in bytes as pkt_size_opts.
Using 'a' corresponds to using a single default value of 1000B.
If a number is specified for pkt_size_opts, the script will use that as
the single size of packets to use, interpreted as bytes. |