iwspy - Get wireless statistics from specific nodes
iwspy interface [+] DNSNAME |
IPADDR | HWADDR [...]
iwspy interface off
iwspy interface setthr low high
iwspy interface getthr
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.
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.
- 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.
- Remove the current list of addresses and disable the spy
- 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
- Retrieve the current low and high signal strength threshold
for the iwspy event.