iwspy(8)


NAME

   iwspy - Get wireless statistics from specific nodes

SYNOPSIS

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

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.

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.

FILES

   /proc/net/wireless

SEE ALSO

   iwconfig(8), iwlist(8), iwevent(8), iwpriv(8), wireless(7).





Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.





Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.


Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.





Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.


Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.





Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.


Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.