1IWSPY(8)                   Linux Programmer's Manual                  IWSPY(8)
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NAME

6       iwspy - Get wireless statistics from specific nodes
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SYNOPSIS

9       iwspy [interface]
10       iwspy interface [+] DNSNAME | IPADDR | HWADDR [...]
11       iwspy interface off
12       iwspy interface setthr low high
13       iwspy interface getthr
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DESCRIPTION

16       Iwspy  is used to set a list of addresses to monitor in a wireless net‐
17       work interface and to read back quality of link information for each of
18       those.   This   information  is  the  same  as  the  one  available  in
19       /proc/net/wireless : quality of the link,  signal  strength  and  noise
20       level.
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22       This information is updated each time a new packet is received, so each
23       address of the list adds some overhead in the driver.
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25       Note that this functionality works only for nodes part of  the  current
26       wireless cell, you can not monitor Access Points you are not associated
27       with (you can use Scanning for that) and nodes in other cells. In  Man‐
28       aged  mode,  in  most  case packets are relayed by the Access Point, in
29       this case you will get the signal strength of  the  Access  Point.  For
30       those  reasons this functionality is mostly useful in Ad-Hoc and Master
31       mode.
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PARAMETERS

34       You may set any number of addresses up to 8.
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36       DNSNAME | IPADDR
37              Set an IP address, or in some cases a DNS name (using  the  name
38              resolver).  As the hardware works with hardware addresses, iwspy
39              will translate this IP address through ARP.  In some case,  this
40              address  might  not  be in the ARP cache and iwspy will fail. In
41              those case, ping(8) this name/address and retry.
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43       HWADDR Set a hardware (MAC) address (this address is not  translated  &
44              checked  like  the IP one). The address must contain a colon (:)
45              to be recognised as a hardware address.
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47       +      Add the new set of addresses at the  end  of  the  current  list
48              instead  of  replacing  it.  The address list is unique for each
49              device, so each user should use this option to avoid conflicts.
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51       off    Remove the current list of addresses and disable the  spy  func‐
52              tionality
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54       setthr Set  the  low  and  high signal strength threshold for the iwspy
55              event (for drivers that support it).
56              Every time the signal strength for any of the address  monitored
57              with iwspy goes lower than the low threshold or goes higher than
58              the high threshold, a Wireless Event will be generated.
59              This can be used to monitor link outages without having  to  run
60              iwspy periodically.
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62       getthr Retrieve  the current low and high signal strength threshold for
63              the iwspy event.
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FILES

67       /proc/net/wireless
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SEE ALSO

70       iwconfig(8), iwlist(8), iwevent(8), iwpriv(8), wireless(7).
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75net-tools                       31 October 1996                       IWSPY(8)
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