= Using Aruba sniffers =

== Purpose ==
The ORBIT grid has four Aruba sniffers at the four corners that can be configured to sniff specific channels and report '''every''' sniffed packet to the database. 
This gives the experimenters an independent framework to correlate 802.11 traffic during the course of the experiment for sanity checking as well as verifying the expected outcome of the experiment.

== Nomenclature ==
The sniffers have been assigned the following IP addresses

|| Sniffer || IP || Position ||
|| aruba1-1 || 10.2.1.1 || Near node1-20 ||
|| aruba1-4 || 10.2.1.4 || Near node1-4 ||
|| aruba4-1 || 10.2.4.1 || Near node20-20 ||
|| aruba4-4 || 10.2.4.4 || Near node20-1 ||

== Usage ==
Sniffers are already up and running. '''Currently they work only on b/g channels'''. Sniffers can be set to listen to a specific channel by using the following command
from internal4 or idb1

{{{
telnet 10.2.1.4
#> echo "channel 1" >> /proc/net/wifi0/config
}}}

== Backend data collection ==

In order to start collecting frames in the database, you need to be on '''internal4.orbit-lab.org'''

 * Download the following file to your local directory and call it config.xml
  {{{
    <project id="monitor">
      <measurements>
        <db id="monitor" host="10.10.0.50" user="orbit" password="orbit"/>
        <multicast-channel addr="224.10.10.1" port="7000" iface="eth1"/>
      </measurements>
    </project>
  }}}

 * Launch the following application from local directory
  {{{
   monitor -c config.xml -n internal4 -i eth2
  }}}

The sniffed packets are reported to the database named ''monitor'' under the table ''frames''

 == Capture Schema ==

|| Field             || Type         ||

|| id                || mediumint(9) ||
|| monitor_id        || varchar(32)  ||
|| channel           || int(11)      ||
|| flag              || int(11)      ||
|| rate              || int(11)      ||
|| snr               || int(11)      ||
|| type              || int(11)      ||
|| sub_type          || int(11)      ||
|| duration          || varchar(32)  ||
|| dst_addr          || varchar(32)  ||
|| src_addr          || varchar(32)  ||
|| receiver_addr     || varchar(32)  ||
|| frag_num          || int(11)      ||
|| seq_num           || int(32)      ||
|| timestamp         || varchar(32)  ||
|| frame_description || varchar(32)  ||
|| beacon_timestamp  || varchar(32)  ||
|| ssid              || varchar(32)  ||

= For Developers =
  For developers interested in playing around with the code, go [wiki:ARuba/Advanced here]