.TH "ATHCTRL" "8" "February 2006" "" "".SH "NAME"\fBathctrl\fP \- sets the maximum distance between communicating stations.SH "SYNOPSIS".B athctrl[-h] [-i device] [-d distance].SH "DESCRIPTION"\fBathctrl\fP sets the maximum distance in meters of stations with which communication occurs. This distance metric determines how much time the radiowaits for an acknowledgment after every transmission and it sets a few other derived timing parameters. This limits the distance between two stations at which the collision avoidance, acknowledgment, retransmission protocols will work correctly. .PPIn particular, when transmitting to too distant stations the radio will start retransmitting packets before an ACK can possibly have been received causing unnecessary retransmissions and collisions. The distance parameter needs to be set properly on all stations that perform long-distance communication irrespective of their mode of operation (master/managed/ad-hoc). For best operation all stations communicating with each other should be set to the samevalue..PP.SH "OPTIONS".TP.B \-i deviceThe madwifi device to apply the settings to. If no device is specified,\fBathctrl\fP defaults to wifi0..TP.B \-d distanceDistance in metric meters..TP .B \-hDisplay usage..PP.SH "EXAMPLES".TP.B athctrl \-i wifi1 \-d 500Set maximum distance of 500m for wifi1..TP.B athctrl 1000Set maximum distance of 1000m for wifi0..PP.SH "SEE ALSO"\fBathchans\fP(8), \fBathkey\fP(8), \fBathstats\fP(8).SH "AUTHOR"This manual page was written by Kel Modderman <kelrin@tpg.com.au> and was basedupon previous text written by Eric S. Raymond and Thorsten von Eicken.