iwspy
Get wireless statistics from specific nodes
see also :
iwconfig - iwlist - iwevent - iwpriv
Synopsis
iwspy
[interface]
iwspy interface [+] DNSNAME
| IPADDR | HWADDR [...]
iwspy interface off
iwspy interface setthr low high
iwspy interface getthr
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examples
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description
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 /proc/net/wireless : quality
of the link, signal strength and noise level.
This
information is updated each time a new packet is received,
so each address of the list adds some overhead in the
driver.
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.
files
/proc/net/wireless
parameters
You may set any number of addresses up to 8.
DNSNAME | IPADDR
Set an IP address, or in some cases a DNS name (using the name
resolver). As the hardware works with hardware addresses,
iwspy will translate this IP address through ARP.
In some case, this address might not be in the ARP cache and
iwspy will fail. In those case, ping(8) this
name/address and retry.
HWADDR
Set a hardware (MAC) address (this address is not translated &
checked like the IP one). The address must contain a colon
(:) to be recognised as a hardware address.
+
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.
off
Remove the current list of addresses and disable the spy
functionality
setthr
Set the low and high signal strength threshold for
the iwspy event (for drivers that support it).
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.
This can be used to monitor link outages without having to run
iwspy periodically.
getthr
Retrieve the current low and high signal strength
threshold for the iwspy event.
see also
iwconfig ,
iwlist , iwevent , iwpriv ,
wireless.