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+.\" Jean II - HPLB - 96
+.\" iwspy.8
+.\"
+.TH IWSPY 8 "31 October 1996" "net-tools" "Linux Programmer's Manual"
+.\"
+.\" NAME part
+.\"
+.SH NAME
+iwspy \- Get wireless statistics from specific nodes
+.\"
+.\" SYNOPSIS part
+.\"
+.SH SYNOPSIS
+.BI "iwspy [" interface ]
+.br
+.BI "iwspy " interface " [+] " DNSNAME " | " IPADDR " | " HWADDR " [...]"
+.br
+.BI "iwspy " interface " off"
+.br
+.BI "iwspy " interface " setthr " "low high"
+.br
+.BI "iwspy " interface " getthr"
+.\"
+.\" DESCRIPTION part
+.\"
+.SH DESCRIPTION
+.B Iwspy
+is used to set a list of addresses to monitor in a wireless network
+interface and to read back quality of link information for each of
+those. This information is the same as the one available in
+.I /proc/net/wireless
+: quality of the link, signal strength and noise level.
+.PP
+This information is updated each time a new packet is received, so
+each address of the list adds some overhead in the driver.
+.PP
+Note that this functionality works only for nodes part of the current
+wireless cell, you can not monitor Access Points you are not
+associated with (you can use Scanning for that) and nodes in other
+cells. In Managed mode, in most case packets are relayed by the Access
+Point, in this case you will get the signal strength of the Access
+Point. For those reasons this functionality is mostly useful in Ad-Hoc
+and Master mode.
+.\"
+.\" PARAMETER part
+.\"
+.SH PARAMETERS
+You may set any number of addresses up to 8.
+.TP
+.BR DNSNAME " | " IPADDR
+Set an IP address, or in some cases a DNS name (using the name
+resolver). As the hardware works with hardware addresses,
+.B iwspy
+will translate this IP address through
+.IR ARP .
+In some case, this address might not be in the ARP cache and
+.B iwspy
+will fail. In those case,
+.IR ping (8)
+this name/address and retry.
+.TP
+.B HWADDR
+Set a hardware (MAC) address (this address is not translated & checked
+like the IP one). The address must contain a colon
+.RB ( : )
+to be recognised as a hardware address.
+.TP
+.B +
+Add the new set of addresses at the end of the current list instead of
+replacing it. The address list is unique for each device, so each user
+should use this option to avoid conflicts.
+.TP
+.B off
+Remove the current list of addresses and disable the spy functionality
+.TP
+.B setthr
+Set the
+.I low
+and
+.I high
+signal strength threshold for the iwspy event (for drivers that
+support it).
+.br
+Every time the signal strength for any of the address monitored
+with iwspy goes lower than the low threshold or goes higher than the
+high threshold, a Wireless Event will be generated.
+.br
+This can be used to monitor link outages without having to run iwspy
+periodically.
+.TP
+.B getthr
+Retrieve the current
+.I low
+and
+.I high
+signal strength threshold for the iwspy event.
+\"
+.\" FILES part
+.\"
+.SH FILES
+.I /proc/net/wireless
+.\"
+.\" SEE ALSO part
+.\"
+.SH SEE ALSO
+.BR iwconfig (8),
+.BR iwlist (8),
+.BR iwevent (8),
+.BR iwpriv (8),
+.BR wireless (7).
+