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           iwspy [interface]
           iwspy interface [+] DNSNAME | IPADDR | HWADDR [...]
           iwspy interface off
           iwspy interface setthr low high
           iwspy interface getthr


           Iwspy  is used to set a list of addresses to monitor in a wireless net-
           work 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
           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  Man-
           aged  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


           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 func-
           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

    net-tools 31 October 1996 IWSPY(8)


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