Wi-Fi

1.Basics

This simple tutorial presents all the basic steps to develop, run, and access the result of a wireless network experiment with OMF 6.

Experiment Scenario

  • This experiment involves two resources of type PC with wireless capabilities: Node 1 and Node 2
  • Node 1 is running a simple UDP traffic generator application (OTG2)
  • Node 2 is running a simple traffic receiver application (OTR2)
  • Node 1 is the “Sender” and will generate and send traffic to the “Receiver” node 2, over a wireless (IEEE 802.11g) channel.
  • OTG and OTR are OML-enabled applications and are configured to report statistics about the sent and received traffic to an OML server.

2.Prerequisites

Accessing/Provisioning Resources

Accessing a Resource at NITOS

Firstly, you have to reserve a node at NITOS: 2.Getting a Slice and Reserving Resources

Provisioning a Resource at NITOS

You can use the method described on 1.Loading an image for instructions on how to load disk images on resources at NITOS. Load your resource with a disk image that contains OMF6. For example load the image baseline_omf6.ndz. More baseline images available here.

Note

Please note that the following nodes are equipped with attenuators:

  • node050 - 20dB
  • node087 - 10dB
  • node091 - 16dB

3.Developing the Experiment

In order to run an experiment with OMF, you first need to describe it into an Experiment Description (ED). An ED is a file/script that is supplied as an input to the Experiment Controller (EC). It contains a detailed description of the resources involved in an experiment and the sets of actions to perform in order to realize that experiment. An ED is written using the OMF Experiment Description Language (OEDL).

The ED for our experiment:

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defApplication('otr2') do |a|

  a.binary_path = "/usr/bin/otr2"
  a.description = <<TEXT
otr is a configurable traffic sink. It contains port to receive
packet streams via various transport options, such as TCP and UDP.
This version 2 is compatible with OMLv2.
TEXT

  a.defProperty('udp_local_host', 'IP address of this Destination node', '--udp:local_host', {:type => :string, :dynamic => false})
  a.defProperty('udp_local_port', 'Receiving Port of this Destination node', '--udp:local_port', {:type => :integer, :dynamic => false})
  a.defMeasurement('udp_in') do |m|
    m.defMetric('ts',:float)
    m.defMetric('flow_id',:long)
    m.defMetric('seq_no',:long)
    m.defMetric('pkt_length',:long)
    m.defMetric('dst_host',:string)
    m.defMetric('dst_port',:long)
  end
end

defApplication('otg2') do |a|

  a.binary_path = "/usr/bin/otg2"
  a.description = <<TEXT
OTG is a configurable traffic generator. It contains generators
producing various forms of packet streams and port for sending
these packets via various transports, such as TCP and UDP.
This version 2 is compatible with OMLv2
TEXT

  a.defProperty('generator', 'Type of packet generator to use (cbr or expo)', '-g', {:type => :string, :dynamic => false})
  a.defProperty('udp_broadcast', 'Broadcast', '--udp:broadcast', {:type => :integer, :dynamic => false})
  a.defProperty('udp_dst_host', 'IP address of the Destination', '--udp:dst_host', {:type => :string, :dynamic => false})
  a.defProperty('udp_dst_port', 'Destination Port to send to', '--udp:dst_port', {:type => :integer, :dynamic => false})
  a.defProperty('udp_local_host', 'IP address of this Source node', '--udp:local_host', {:type => :string, :dynamic => false})
  a.defProperty('udp_local_port', 'Local Port of this source node', '--udp:local_port', {:type => :integer, :dynamic => false})
  a.defProperty("cbr_size", "Size of packet [bytes]", '--cbr:size', {:dynamic => true, :type => :integer})
  a.defProperty("cbr_rate", "Data rate of the flow [kbps]", '--cbr:rate', {:dynamic => true, :type => :integer})
  a.defProperty("exp_size", "Size of packet [bytes]", '--exp:size', {:dynamic => true, :type => :integer})
  a.defProperty("exp_rate", "Data rate of the flow [kbps]", '--exp:rate', {:dynamic => true, :type => :integer})
  a.defProperty("exp_ontime", "Average length of burst [msec]", '--exp:ontime', {:dynamic => true, :type => :integer})
  a.defProperty("exp_offtime", "Average length of idle time [msec]", '--exp:offtime', {:dynamic => true, :type => :integer})
  a.defMeasurement('udp_out') do |m|
    m.defMetric('ts',:float)
    m.defMetric('flow_id',:long)
    m.defMetric('seq_no',:long)
    m.defMetric('pkt_length',:long)
    m.defMetric('dst_host',:string)
    m.defMetric('dst_port',:long)
  end
end

defGroup('Sender', "node006") do |node|
  node.addApplication("otg2") do |app|
    app.setProperty('udp_local_host', '192.168.0.2')
    app.setProperty('udp_dst_host', '192.168.0.3')
    app.setProperty('udp_dst_port', 3000)
    app.measure('udp_out', :interval => 3)
  end
  node.net.w0.mode = "adhoc"
  node.net.w0.type = 'g'
  node.net.w0.channel = "6"
  node.net.w0.essid = "helloworld"
  node.net.w0.ip = "192.168.0.2/24"
end

defGroup('Receiver', "node007") do |node|
  node.addApplication("otr2") do |app|
    app.setProperty('udp_local_host', '192.168.0.3')
    app.setProperty('udp_local_port', 3000)
    app.measure('udp_in', :interval => 3)
  end
  node.net.w0.mode = "adhoc"
  node.net.w0.type = 'g'
  node.net.w0.channel = "6"
  node.net.w0.essid = "helloworld"
  node.net.w0.ip = "192.168.0.3/24"
end

onEvent(:ALL_UP_AND_INSTALLED) do |event|
  info "This is my first OMF experiment-simos"
  after 5 do
    allGroups.startApplications
    info "All my Applications are started now..."
  end
  after 40 do
    allGroups.stopApplications
    info "All my Applications are stopped now."
    Experiment.done
  end
end

You can see here more about (OMF6-OEDL)

4.Running Experiment

a) How do you run it?

In order to run your experiment you have to:

  • save its description in a file on your computer or in the NITOS server, thus either
    • cut-and-paste the above ED listing into a new file named ‘tutorial01.rb’
    • download the ED directly: ED_script

  • open a terminal and navigate to the folder/directory where you saved that file

  • start the EC software and tell it to execute the experiment described in your ED file, using the command line:

    omf_ec -u xmpp://usr:pwd@my_xmpp.com exec --oml_uri tcp:srv:port tutorial01.rb

  • So for our example, xmpp server and OML server run at nitlab.inf.uth.gr. Then you would use the command:

    omf_ec -u xmpp://nitlab.inf.uth.gr exec --oml_uri tcp:nitlab.inf.uth.gr:3003 tutorial01.rb

If you would like to know more about the other options of the OMF EC software please run the commands:

omf_ec help
omf_ec help exec

b) What will happen next?

When running the EC with the above command, you should see an output similar to this :

OMF Experiment Controller - Copyright (c) 2012-13 National ICT Australia Limited (NICTA)
{:type=>:xml, :authenticate=>nil}
19:33:06 INFO  XMPP::Communicator: Connecting to 'nitlab.inf.uth.gr' ...
INFO OML4R Client 2.10.4 [OMSPv4; Ruby 1.9.3] Copyright 2009-2014, NICTA
INFO Collection URI is tcp:nitlab.inf.uth.gr:3003
19:33:07 INFO  XMPP::Communicator: Connected
19:33:07 INFO  Object: OMF Experiment Controller 6.1.1 - Start
19:33:07 INFO  Object: Connected using {:proto=>:xmpp, :user=>simos-aspire-5739g-7586, :domain=>nitlab.inf.uth.gr}
19:33:07 INFO  Object: Execute: /home/simos/Eidiko/tutorial01.rb
19:33:07 INFO  Object: Properties: {}
19:33:07 INFO  OmfEc::Experiment: Experiment: 2014-08-02T16:33:05.420Z starts
19:33:07 INFO  OmfEc::Experiment: Configure 'node017' to join 'Sender'
19:33:07 INFO  OmfEc::Experiment: Configure 'node023' to join 'Receiver'
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://node023@nitlab.inf.uth.gr
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://node017@nitlab.inf.uth.gr
19:33:08 INFO  OmfEc::Experiment: Event triggered: 'ALL_NODES_UP, ALL_UP'
19:33:08 INFO  OmfEc::Experiment: Config xmpp://node023@nitlab.inf.uth.gr to join Receiver
19:33:08 INFO  OmfEc::Experiment: Config xmpp://node017@nitlab.inf.uth.gr to join Sender
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://9f5677f9-590c-472b-8e46-f888b73e5c73@nitlab.inf.uth.gr
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://e6d3a0e5-5cca-44d1-b146-e49bc78b72e9@nitlab.inf.uth.gr
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://62c416b5-f49e-426c-8cfe-276922443673@nitlab.inf.uth.gr
19:33:09 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://9071a6c8-222f-41c2-a410-439f49907607@nitlab.inf.uth.gr
19:33:09 INFO  OmfEc::Experiment: Event triggered: 'ALL_UP_AND_INSTALLED'
19:33:09 INFO  Object: This is my first OMF experiment-simos
19:33:14 INFO  Object: All my Applications are started now...
19:33:14 INFO  OmfEc: APP_EVENT STARTED from app otr2_cxt_0 - msg: env -i /usr/bin/otr2 --udp:local_host 192.168.0.3
--udp:local_port 3000   --oml-config /tmp/9f5677f9-590c-472b-8e46-f888b73e5c73-1406997194.xml
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otr2_cxt_0 - msg: Aug 02 19:33:14 INFO       OTG2 Traffic Sink 2.10.0
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otg2_cxt_0 - msg: Aug 02 19:33:14 INFO       OTG2 Traffic Generator 2.10.0
19:33:14 INFO  OmfEc: APP_EVENT STARTED from app otg2_cxt_0 - msg: env -i /usr/bin/otg2 --udp:dst_host 192.168.0.3
--udp:dst_port 3000 --"   "udp:local_host 192.168.0.2 --oml-config /tmp/62c416b5-f49e-426c-8cfe-276922443673-1406997194.xml
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otg2_cxt_0 - msg: INFO OML Client 2.11.0 [OMSPv5] Copyright 2007-2014, NICTA
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otr2_cxt_0 - msg: INFO OML Client 2.11.0 [OMSPv5] Copyright 2007-2014, NICTA
19:33:17 INFO  OmfEc: APP_EVENT STDERR from app otr2_cxt_0 - msg: INFO tcp:nitlab.inf.uth.gr:3003: Connected
19:33:17 INFO  OmfEc: APP_EVENT STDERR from app otg2_cxt_0 - msg: INFO tcp:nitlab.inf.uth.gr:3003: Connected
19:33:49 INFO  Object: All my Applications are stopped now.
19:33:49 INFO  OmfEc::Experiment: Experiment: 2014-08-02T16:33:05.420Z finished
19:33:49 INFO  OmfEc::Experiment: Release applications and network interfaces
19:33:49 INFO  OmfEc::Experiment: Exit in 15 seconds...
19:33:53 INFO  OmfEc: APP_EVENT EXIT from app otr2_cxt_0 - msg: 0
19:33:53 INFO  OmfEc: APP_EVENT EXIT from app otg2_cxt_0 - msg: 0
19:34:03 INFO  OmfEc::Experiment: OMF Experiment Controller 6.1.1 - Exit.
19:34:04 INFO  XMPP::Communicator: Disconnecting...

c) What does that screen output mean?

First the EC provides us with some information about the parameters of this experiment (Experiment ID, XMPP server used, resourcesused,...):

OMF Experiment Controller - Copyright (c) 2012-13 National ICT Australia Limited (NICTA)
{:type=>:xml, :authenticate=>nil}
19:33:06 INFO  XMPP::Communicator: Connecting to 'nitlab.inf.uth.gr' ...
INFO OML4R Client 2.10.4 [OMSPv4; Ruby 1.9.3] Copyright 2009-2014, NICTA
INFO Collection URI is tcp:nitlab.inf.uth.gr:3003
19:33:07 INFO  XMPP::Communicator: Connected
19:33:07 INFO  Object: OMF Experiment Controller 6.1.1 - Start
19:33:07 INFO  Object: Connected using {:proto=>:xmpp, :user=>simos-aspire-5739g-7586, :domain=>nitlab.inf.uth.gr}
19:33:07 INFO  Object: Execute: /home/simos/Eidiko/tutorial01.rb
19:33:07 INFO  Object: Properties: {}
19:33:07 INFO  OmfEc::Experiment: Experiment: 2014-08-02T16:33:05.420Z starts
19:33:07 INFO  OmfEc::Experiment: Configure 'node017' to join 'Sender'

It also provides us some feedback about its communication with the XMPP server and other OMF entities:

19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://node023@nitlab.inf.uth.gr
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://node017@nitlab.inf.uth.gr

19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://9f5677f9-590c-472b-8e46-f888b73e5c73@nitlab.inf.uth.gr
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://e6d3a0e5-5cca-44d1-b146-e49bc78b72e9@nitlab.inf.uth.gr
19:33:08 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://62c416b5-f49e-426c-8cfe-276922443673@nitlab.inf.uth.gr
19:33:09 INFO  OmfEc::Experiment: Newly discovered resource >> xmpp://9071a6c8-222f-41c2-a410-439f49907607@nitlab.inf.uth.gr

19:34:04 INFO  XMPP::Communicator: Disconnecting...

Then it also informs us when a defined event has been triggered:

19:33:08 INFO  OmfEc::Experiment: Event triggered: 'ALL_NODES_UP, ALL_UP'
19:33:09 INFO  OmfEc::Experiment: Event triggered: 'ALL_UP_AND_INSTALLED'"

Finally, when an event is triggered (such as ALL_UP_AND_INSTALLED), it informs us about the tasks executed for that event, and their results/outputs:

19:33:09 INFO  OmfEc::Experiment: Event triggered: 'ALL_UP_AND_INSTALLED'
19:33:09 INFO  Object: This is my first OMF experiment-simos
19:33:14 INFO  Object: All my Applications are started now...
19:33:14 INFO  OmfEc: APP_EVENT STARTED from app otr2_cxt_0 - msg: env -i /usr/bin/otr2 --udp:local_host 192.168.0.3
--udp:local_port 3000   --oml-config /tmp/9f5677f9-590c-472b-8e46-f888b73e5c73-1406997194.xml
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otr2_cxt_0 - msg: Aug 02 19:33:14 INFO       OTG2 Traffic Sink 2.10.0
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otg2_cxt_0 - msg: Aug 02 19:33:14 INFO       OTG2 Traffic Generator 2.10.0
19:33:14 INFO  OmfEc: APP_EVENT STARTED from app otg2_cxt_0 - msg: env -i /usr/bin/otg2 --udp:dst_host 192.168.0.3
--udp:dst_port 3000 --"   "udp:local_host 192.168.0.2 --oml-config /tmp/62c416b5-f49e-426c-8cfe-276922443673-1406997194.xml
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otg2_cxt_0 - msg: INFO OML Client 2.11.0 [OMSPv5] Copyright 2007-2014, NICTA
19:33:14 INFO  OmfEc: APP_EVENT STDERR from app otr2_cxt_0 - msg: INFO OML Client 2.11.0 [OMSPv5] Copyright 2007-2014, NICTA
19:33:17 INFO  OmfEc: APP_EVENT STDERR from app otr2_cxt_0 - msg: INFO tcp:nitlab.inf.uth.gr:3003: Connected
19:33:17 INFO  OmfEc: APP_EVENT STDERR from app otg2_cxt_0 - msg: INFO tcp:nitlab.inf.uth.gr:3003: Connected
19:33:49 INFO  Object: All my Applications are stopped now.
19:33:49 INFO  OmfEc::Experiment: Experiment: 2014-08-02T16:33:05.420Z finished
19:33:49 INFO  OmfEc::Experiment: Release applications and network interfaces
19:33:49 INFO  OmfEc::Experiment: Exit in 15 seconds...
19:33:53 INFO  OmfEc: APP_EVENT EXIT from app otr2_cxt_0 - msg: 0
19:33:53 INFO  OmfEc: APP_EVENT EXIT from app otg2_cxt_0 - msg: 0
19:34:03 INFO  OmfEc::Experiment: OMF Experiment Controller 6.1.1 - Exit.

5.Accesing Results

You can access your results here More information about accessing the results of your experiment: Accessing the measurements gathered from your OMF experiment