HOWTO use ns-3 in the ORBIT testbed environment: Difference between revisions

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'''Note:''' Some of the ns-3 documentation is stale below, as it references a program emu-udp-echo-client
and emu-udp-echo-server that are not part of ns-3.  The closest corresponding program in current ns-3
(as of ns-3.22) is src/fd-net-device/examples/fd-emu-udp-echo.cc.


We provide a realtime emulation package that allows us to connect ns-3 to real
We provide a realtime emulation package that allows us to connect ns-3 to real
Line 7: Line 11:
emulator provides a large two-dimensional grid of 400 802.11 radio nodes as well as
emulator provides a large two-dimensional grid of 400 802.11 radio nodes as well as
a number of smaller "sandbox" testbeds to allow one to test without reserving the  
a number of smaller "sandbox" testbeds to allow one to test without reserving the  
main grid.  This HOWTO shows how ns-3 scripts can be used to drive these radio nodes.
main grid. 
 
In [[HOWTO use ns-3 directly on the ORBIT testbed hardware]] we showed how to use
the ORBIT hardware as a basis for ns-3 experiments.  This HOWTO shows how one can
use ORBIT tools to automate the process of getting an experiment run.
 
We assume that you have some experience with the ORBIT system and understand the
basic environment.  If you are new to ORBIT, please take a look at
http://www.orbit-lab.org/ and go through the "Basic Tutorial" and the "Tutorials
on controlling the testbed nodes" at a minimum.  We will assume throughout this
HOWTO that you have registered for an ORBIT account and have made a reservation
on the ORBIT Scheduler for a testbed.  This HOWTO assumes that you are on the
sandbox one (sb1) testbed.  We further assume that you have at least read the
[[HOWTO use ns-3 directly on the ORBIT testbed hardware]] and understand what it
is we are trying to automate here.


== HOWTO use ns-3 in the ORBIT testbed environment ==
== HOWTO use ns-3 in the ORBIT testbed environment ==
We assume that you have some experience with the ORBIT system.  If you are new to
ORBIT, please take a look at http://www.orbit-lab.org/ and go through the "Basic
Tutorial" and the "Tutorials on controlling the testbed nodes" at a minimum.  We
will assume throughout this HOWTO that you have registered for an ORBIT account and
have made a reservation on the ORBIT Scheduler for a testbed.  This HOWTO assumes
that you are on the sandbox one (sb1) testbed.


We provide a node image on the ORBIT system that includes everything you need to
We provide a node image on the ORBIT system that includes everything you need to
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GNU toolchain, a copy of a precompiled ns-3.3 repository, emacs editor, etc.  The
GNU toolchain, a copy of a precompiled ns-3.3 repository, emacs editor, etc.  The
first step is to get this environment up on the nodes in your testbed.  In ORBIT
first step is to get this environment up on the nodes in your testbed.  In ORBIT
terminology, we need to "image the nodes." This is a somewhat time-consuming
terminology, we need to "image the nodes."
process since you are actually copying disk images to the sandbox nodes.


1.  Connect to the sandbox console, image the sandbox nodes and power them up
1.  Connect to the sandbox console, image the sandbox nodes and power them up
     a.  ssh your-orbit-user-name@console.sb1.orbit-lab.org;
     a.  ssh your-orbit-user-name@console.sb1.orbit-lab.org;
     b.  orbit load all ns-3.3.ndz
     b.  orbit load all ns-3.5.ndz 1200
     c.  orbit tell on all
 
This is a somewhat time-consuming process since you are actually copying disk
images to the sandbox nodes.  We have a relatively large image since it contains the
entire GNU toolchain, ns-3, its reference traces, NSC, etc., and so we need to bump up
the default timeout (with the 1200 second timeout specified in 1.a above).  The example
below took almost seventeen minutes to complete, so you must have patience! 
 
You should see status messages appearing which indicate that the imaging process is
proceeding as expected: 
 
      Imaging nodes: 'system:topo:all' with image 'ns-3.5.ndz'
      (Domain:  default from hostname)
      (Timeout:  1200 sec.)
      INFO init: NodeHandler Version 4.4.0 (1921)
      INFO init: Experiment ID: sb1_2009_07_10_01_07_20
      INFO NodeHandler: Shutdown Flag Set - Switching all nodes Off...
      INFO Experiment: load system:exp:stdlib
      INFO prop.resetDelay: resetDelay = 210:Fixnum
      INFO prop.resetTries: resetTries = 1:Fixnum
      INFO Experiment: load system:exp:imageNode
      INFO prop.nodes: nodes = "system:topo:all":String
      INFO prop.image: image = "ns-3.5.ndz":String
      INFO prop.domain: domain = nil:NilClass
      INFO prop.timeout: timeout = 1200:Fixnum
      INFO Topology: Loading topology 'system:topo:all'.
      INFO stdlib: Waiting for nodes (Up/Down/Total): 0/2/2 - (still down: n_1_1,n_1_2)
     
      ...
 
      INFO whenAll: *: 'status[@value='UP']' fires
      INFO exp: Progress(0/0/2): 0/0/0 min(n_1_2)/avg/max (82) - Timeout: 1110 sec.
      INFO exp: Progress(0/0/2): 0/0/0 min(n_1_2)/avg/max (82) - Timeout: 1100 sec.
      INFO exp: Progress(0/0/2): 0/0/0 min(n_1_2)/avg/max (82) - Timeout: 1090 sec.
           
      ...
     
      INFO exp: Progress(1/0/2): 90/95/100 min(n_1_2)/avg/max (82) - Timeout: 225 sec.
      INFO exp: Progress(1/0/2): 90/95/100 min(n_1_2)/avg/max (82) - Timeout: 215 sec.
      INFO exp: Progress(2/0/2): 100/100/100 min()/avg/max (82) - Timeout: 205 sec.
      INFO exp:  -----------------------------
      INFO exp:  Imaging Process Done
      INFO exp:  - 2 node(s) succesfully imaged - See the topology file: 'system_topo_active_sb1.rb'
      INFO exp:  -----------------------------
      INFO Experiment: DONE!
      INFO ExecApp: Application 'commServer' finished
      INFO run: Experiment sb1_2009_07_13_02_47_05 finished after 16:46   
 
You can now take a look at the status of the nodes.  Observe that they are in the
POWEROFF state
 
     c.  orbit stat
 
        -----------------------------------------------
        INFO Topology: Loading topology 'system:topo:all'.
        Testbed : sb1
        Node n_1_1 - State: POWEROFF
        Node n_1_2 - State: POWEROFF
        -----------------------------------------------
 
You can now power up the nodes in the sandbox
 
    d.  orbit tell on all
 
        INFO Topology: Loading topology 'system:topo:all'.
        ---------------------------------------------------
        Testbed : sb1 - Command: on
        Node n_1_2 - Ok
        Node n_1_1 - Ok
        ---------------------------------------------------
 
and see that the nodes are now powered up (you may have to wait for a short time
to see the state change happen)
 
    e.  orbit stat
 
        -----------------------------------------------
        INFO Topology: Loading topology 'system:topo:all'.
        Testbed : sb1
        Node n_1_1 - State: POWERON
        Node n_1_2 - State: POWERON
        -----------------------------------------------


When you are done with this step, the sandbox nodes will have been powered up and
When you are done with this step, the sandbox nodes will have been powered up and
will be in the process of booting.  You now need to connect to the individual
will be in the process of booting.  You need to wait until this process has
nodes in the sandbox and configure them.  You may find it convenient to open
completed.  One way to do this is to ping the sandbox nodes.
a couple of terminal windows for this process.  You may see a route not found error
until the nodes are actually done rebooting as a result of the power on step (1.c)
above.  Note that we configure "ath0" on node [1,1] tp be an access point, and
"ath0" on node [1,2] to be a station.  We have to place the cards in promiscuous
mode for the emu net device to work.


2.  Connect to node [1,1] and configure its wireless
2.  Ping the sandbox nodes to make sure they are up.
     a.  ssh root@node1-1
     a.  ping -c 1 node1-1
    b.  wlanconfig ath0 destroy
    c.  wlanconfig ath0 create wlandev wifi0 wlanmode ap
    d.  ifconfig ath0 192.168.1.1 netmask 255.255.255.0
    e.  ifconfig atho promisc up


3. Connect to node [1,2] and configure its wireless
    PING node1-1.sb1.orbit-lab.org (10.11.1.1) 56(84) bytes of data.
     a. ssh root@node1-2
     64 bytes from node1-1.sb1.orbit-lab.org (10.11.1.1): icmp_seq=1 ttl=64 time=0.422 ms
    b. wlanconfig ath0 destroy
      
     c.  wlanconfig ath0 create wlandev wifi0 wlanmode sta
     --- node1-1.sb1.orbit-lab.org ping statistics ---
     d. ifconfig ath0 192.168.1.2 netmask 255.255.255.0
    1 packets transmitted, 1 received, 0% packet loss, time 0ms
    e. ifconfig atho promisc up
    rtt min/avg/max/mdev = 0.422/0.422/0.422/0.000 ms


Before going any further, let's make sure that the wireless cards can talk to
    b.  ping -c 1 node1-2
each other.  From now on, when I refer to [1,1] assume that it means the ssh
window into root@node1-1 and when I refer to [1,2] it means root@node1-2.


4. Ping from [1,1] to [1,2]
    PING node1-2.sb1.orbit-lab.org (10.11.1.2) 56(84) bytes of data.
     a. ping 192.168.1.2
    64 bytes from node1-2.sb1.orbit-lab.org (10.11.1.2): icmp_seq=1 ttl=64 time=3.62 ms
   
    --- node1-2.sb1.orbit-lab.org ping statistics ---
    1 packets transmitted, 1 received, 0% packet loss, time 0ms
     rtt min/avg/max/mdev = 3.624/3.624/3.624/0.000 ms


5.  Ping from [1,2] to [1,1]
Now, you can write a simple ruby script to go out and pull the updated ns-3 code
    a.  ping 192.168.1.1
from the repository.  Using your favorite editor, copy the following code into a
file called "ns-3-prepare.rb":


Now that you have a working hardware configuration, you can go ahead and get
    Experiment.name = "ns-3-prepare"
ns-3 up and running. The image you loaded is of a vanilla ns-3.3 distribution.
   
In that distro there are no example programs handy which can drive the two nodes
    defGroup('server', [1,1]) { |node|
in the sandbox. We provide a couple of example progams on one of our developers'
      node.image = "ns-3.5.ndz"
private repositories to get you started. 
    }
   
    defGroup('client', [1,2]) { |node|
      node.image = "ns-3.5.ndz"
    }
   
    whenAllUp() { |node|
      allGroups.exec("/usr/local/bin/wlanconfig ath0 destroy")
      wait 2
      group("server").exec("/usr/local/bin/wlanconfig ath0 create wlandev wifi0 wlanmode ap")
      wait 2
      group("client").exec("/usr/local/bin/wlanconfig ath0 create wlandev wifi0 wlanmode sta")
      wait 2
      allGroups.exec("ifconfig ath0 promisc up")
      wait 2
      allGroups.exec("cd /home/repos/ns-3.3; hg pull http://code.nsnam.org/craigdo/ns-3.3-orbit; hg update; ./waf")
      wait 500
      Experiment.done
    }


6.  Pull the examples into [1,1] and build them
    ''Sidebar:  Note the wait statements in the above code.  There is''
     a.  cd /home/repos/ns-3.3
     ''apparently no way to execute a command synchronously on multiple nodes''
     b. hg pull http://code.nsnam.org/craigdo/ns-3.3-orbit
    ''using ORBIT tools.  Thus, we seem  faced with a tradeoff. Either ssh''
     c.  ./waf
     ''into the nodes and perform the actions manually and synchronously,''
    ''or automate them and possibly wait longer than absolutely necessary.''
    ''It seems safe to control-C out of the script after the compilations''
     ''are done.''


7.  Pull the examples into [1,2] and build them
2.  Execute the ns-3-prepare.rb command script.
     a. cd /home/repos/ns-3.3
    a.  orbit exec ns-3-prepare
     b.  hg pull http://code.nsnam.org/craigdo/ns-3.3-orbit
 
     c. ./waf
    INFO init: NodeHandler Version 4.2.0 (1272)
    INFO init: Experiment ID: sb1_2009_01_12_20_34_55
    INFO Experiment: load system:exp:stdlib
    INFO prop.resetDelay: resetDelay = 210:Fixnum
    INFO prop.resetTries: resetTries = 1:Fixnum
    INFO Experiment: load ns-3-prepare
    INFO stdlib: Waiting for nodes (Up/Down/Total): 0/2/2 - (still down: n_1_2,n_1_1)
    ...
    INFO whenAll: *: 'status[@value='UP']' fires
    INFO whenAll: *: 'status[@value='UP']' fires
    INFO exp: Request from Experiment Script: Wait for 10s....
    Event DONE.OK (from /usr/local/bin/wlanconfig@n_1_2): status: 0
     Event DONE.OK (from /usr/local/bin/wlanconfig@n_1_1): status: 0
    INFO exp: Request from Experiment Script: Wait for 10s....
     ...
    INFO exp: Request from Experiment Script: Wait for 500s....
    Message (from cd@n_1_2): pulling from http://code.nsnam.org/craigdo/ns-3.3-orbit
     Message (from cd@n_1_2):  searching for changes
    Message (from cd@n_1_2):  no changes found
    ...
    familiar waf output from ns-3
    ...
    Event DONE.OK (from cd@n_1_1): status: 0
    INFO Experiment: DONE!
    INFO ExecApp: Application 'commServer' finished
    INFO run: Experiment sb1_2009_01_12_20_34_55 finished after 10:35
 
Notice that this script has taken care of setting up the wireless devices
for you.


Now you can run the example ns-3 client server scripts on the testbed.  We have  
Now you can run the example ns-3 client server scripts on the testbed.  We have  
Line 83: Line 216:
station.  Both devices must be in promiscuous mode.  This can all be verified by
station.  Both devices must be in promiscuous mode.  This can all be verified by
using "ifconfig" and "iwconfig" on the appropriate console.
using "ifconfig" and "iwconfig" on the appropriate console.
This is annoying, but for now we have got to manually set the hardware address
of the interfaces in the ns-3 simulation script.
3.  Set the hardware address of the interface in the server script on node [1,1]
    a. ifconfig
Locate the output for the device ath0 in the output of ifconfig
        ath0      Link encap:Ethernet  HWaddr 06:60:b3:ac:2b:f5
                  inet6 addr: fe80::460:b3ff:feac:2bf5/64 Scope:Link
                  UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
                  RX packets:1728 errors:0 dropped:0 overruns:0 frame:0
                  TX packets:42 errors:0 dropped:0 overruns:0 carrier:0
                  collisions:0 txqueuelen:0
                  RX bytes:1769806 (1.6 MiB)  TX bytes:2216 (2.1 KiB)
Copy the HWaddr to the clipboard (in this case, 06:60:b3:ac:2b:f5)
    b.  cd examples
    c.  emacs emu-udp-echo-server.cc    # or use your favorite editor
Search for the MAC address assigmnet and replace the string with the HWaddr
you just found, for example,
    ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("00:00:00:00:00:01")));
becomes
    ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("06:60:b3:ac:2b:f5")))'
Save the changes and build
    d.  cd ..
    e.  ./waf
4.  Set the hardware address of the interface in the client script on node [1,2]
    a. ifconfig
Locate the output for the device ath0 in the output of ifconfig
        ath0      Link encap:Ethernet  HWaddr 06:60:b3:b0:c6:a4
                  inet6 addr: fe80::460:b3ff:feb0:c6a4/64 Scope:Link
                  UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
                  RX packets:72 errors:0 dropped:0 overruns:0 frame:0
                  TX packets:851 errors:0 dropped:0 overruns:0 carrier:0
                  collisions:0 txqueuelen:0
                  RX bytes:1900 (1.8 KiB)  TX bytes:890770 (869.8 KiB)
Copy the HWaddr to the clipboard (in this case, 06:60:b3:b0:c6:a4)
    b.  cd examples
    c.  emacs emu-udp-echo-client.cc    # or use your favorite editor
Search for the MAC address assigmnet and replace the string with the HWaddr
you just found, for example,
    ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("00:00:00:00:00:01")));
becomes
    ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("06:60:b3:b0:c6:a4")))'
Save the changes and build
    d.  cd ..
    e.  ./waf


In this simple example, we are just going to manually start one ns-3 simulation
In this simple example, we are just going to manually start one ns-3 simulation
Line 90: Line 291:
to dawdle after running the server -- it exits automatically after 60 seconds.
to dawdle after running the server -- it exits automatically after 60 seconds.


8.  Run the server on [1,1]
5.  Run the server on [1,1]
     a.  ./waf --run emu-udp-echo-server
     a.  ./waf --run emu-udp-echo-server


9.  Run the client on [1,2]
6.  Run the client on [1,2]
     a.  ./waf --run emu-udp-echo-client
     a.  ./waf --run emu-udp-echo-client


Congratulations, you have now run your ns-3 simulation scripts on a testbed.
Congratulations, you have now run your ns-3 simulation scripts on a testbed.
That was exciting, wasn't it.
You can now look at the trace files on the client [1,2] and server [1,1] nodes
and see what you've done.  For example, to look at the pcap traces on the client
node:
7. Display the pcap trace on [1,2]
    a. cd ..
    b. tcpdump -nn -tt -r emu-udp-echo-client-0-0.pcap  | more


----
----


[[User:Craigdo|Craigdo]] 01:47, 31 December 2008 (UTC)
[[User:Craigdo|Craigdo]] 19:30, 14 July 2009 (UTC)

Latest revision as of 21:57, 6 October 2014

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Note: Some of the ns-3 documentation is stale below, as it references a program emu-udp-echo-client and emu-udp-echo-server that are not part of ns-3. The closest corresponding program in current ns-3 (as of ns-3.22) is src/fd-net-device/examples/fd-emu-udp-echo.cc.

We provide a realtime emulation package that allows us to connect ns-3 to real networks on real machines. Typically the real network will be a testbed of some kind. ORBIT is a two-tier laboratory emulator/field trial network project of WINLAB (Wireless Information Network Laboratory), at Rutgers. This wireless network emulator provides a large two-dimensional grid of 400 802.11 radio nodes as well as a number of smaller "sandbox" testbeds to allow one to test without reserving the main grid.

In HOWTO use ns-3 directly on the ORBIT testbed hardware we showed how to use the ORBIT hardware as a basis for ns-3 experiments. This HOWTO shows how one can use ORBIT tools to automate the process of getting an experiment run.

We assume that you have some experience with the ORBIT system and understand the basic environment. If you are new to ORBIT, please take a look at http://www.orbit-lab.org/ and go through the "Basic Tutorial" and the "Tutorials on controlling the testbed nodes" at a minimum. We will assume throughout this HOWTO that you have registered for an ORBIT account and have made a reservation on the ORBIT Scheduler for a testbed. This HOWTO assumes that you are on the sandbox one (sb1) testbed. We further assume that you have at least read the HOWTO use ns-3 directly on the ORBIT testbed hardware and understand what it is we are trying to automate here.

HOWTO use ns-3 in the ORBIT testbed environment

We provide a node image on the ORBIT system that includes everything you need to get an ns-3 environment up and running on your testbed nodes. This includes the GNU toolchain, a copy of a precompiled ns-3.3 repository, emacs editor, etc. The first step is to get this environment up on the nodes in your testbed. In ORBIT terminology, we need to "image the nodes."

1. Connect to the sandbox console, image the sandbox nodes and power them up 

   a.  ssh your-orbit-user-name@console.sb1.orbit-lab.org;
   b.  orbit load all ns-3.5.ndz 1200

This is a somewhat time-consuming process since you are actually copying disk images to the sandbox nodes. We have a relatively large image since it contains the entire GNU toolchain, ns-3, its reference traces, NSC, etc., and so we need to bump up the default timeout (with the 1200 second timeout specified in 1.a above). The example below took almost seventeen minutes to complete, so you must have patience!

You should see status messages appearing which indicate that the imaging process is proceeding as expected: 

      Imaging nodes: 'system:topo:all' with image 'ns-3.5.ndz'
     (Domain:  default from hostname)
     (Timeout:  1200 sec.)
      INFO init: NodeHandler Version 4.4.0 (1921)
      INFO init: Experiment ID: sb1_2009_07_10_01_07_20
      INFO NodeHandler: Shutdown Flag Set - Switching all nodes Off...
      INFO Experiment: load system:exp:stdlib
      INFO prop.resetDelay: resetDelay = 210:Fixnum
      INFO prop.resetTries: resetTries = 1:Fixnum
      INFO Experiment: load system:exp:imageNode
      INFO prop.nodes: nodes = "system:topo:all":String
      INFO prop.image: image = "ns-3.5.ndz":String
      INFO prop.domain: domain = nil:NilClass
      INFO prop.timeout: timeout = 1200:Fixnum
      INFO Topology: Loading topology 'system:topo:all'.
      INFO stdlib: Waiting for nodes (Up/Down/Total): 0/2/2 - (still down: n_1_1,n_1_2)
      
      ...

      INFO whenAll: *: 'status[@value='UP']' fires
      INFO exp: Progress(0/0/2): 0/0/0 min(n_1_2)/avg/max (82) - Timeout: 1110 sec.
      INFO exp: Progress(0/0/2): 0/0/0 min(n_1_2)/avg/max (82) - Timeout: 1100 sec.
      INFO exp: Progress(0/0/2): 0/0/0 min(n_1_2)/avg/max (82) - Timeout: 1090 sec.
           
      ...
      
      INFO exp: Progress(1/0/2): 90/95/100 min(n_1_2)/avg/max (82) - Timeout: 225 sec.
      INFO exp: Progress(1/0/2): 90/95/100 min(n_1_2)/avg/max (82) - Timeout: 215 sec.
      INFO exp: Progress(2/0/2): 100/100/100 min()/avg/max (82) - Timeout: 205 sec.
      INFO exp:  -----------------------------
      INFO exp:  Imaging Process Done
      INFO exp:  - 2 node(s) succesfully imaged - See the topology file: 'system_topo_active_sb1.rb'
      INFO exp:  -----------------------------
      INFO Experiment: DONE!
      INFO ExecApp: Application 'commServer' finished
      INFO run: Experiment sb1_2009_07_13_02_47_05 finished after 16:46

You can now take a look at the status of the nodes. Observe that they are in the POWEROFF state 

   c.  orbit stat

       -----------------------------------------------
        INFO Topology: Loading topology 'system:topo:all'.
        Testbed : sb1
        Node n_1_1 - State: POWEROFF
        Node n_1_2 - State: POWEROFF
       -----------------------------------------------

You can now power up the nodes in the sandbox 

   d.  orbit tell on all

        INFO Topology: Loading topology 'system:topo:all'.
       ---------------------------------------------------
        Testbed : sb1 - Command: on
        Node n_1_2 - Ok
        Node n_1_1 - Ok
       ---------------------------------------------------

and see that the nodes are now powered up (you may have to wait for a short time to see the state change happen) 

   e.  orbit stat

       -----------------------------------------------
        INFO Topology: Loading topology 'system:topo:all'.
        Testbed : sb1
        Node n_1_1 - State: POWERON
        Node n_1_2 - State: POWERON
       -----------------------------------------------

When you are done with this step, the sandbox nodes will have been powered up and will be in the process of booting. You need to wait until this process has completed. One way to do this is to ping the sandbox nodes.

2. Ping the sandbox nodes to make sure they are up. 

   a.  ping -c 1 node1-1

   PING node1-1.sb1.orbit-lab.org (10.11.1.1) 56(84) bytes of data.
   64 bytes from node1-1.sb1.orbit-lab.org (10.11.1.1): icmp_seq=1 ttl=64 time=0.422 ms
   
   --- node1-1.sb1.orbit-lab.org ping statistics ---
   1 packets transmitted, 1 received, 0% packet loss, time 0ms
   rtt min/avg/max/mdev = 0.422/0.422/0.422/0.000 ms

   b.  ping -c 1 node1-2

   PING node1-2.sb1.orbit-lab.org (10.11.1.2) 56(84) bytes of data.
   64 bytes from node1-2.sb1.orbit-lab.org (10.11.1.2): icmp_seq=1 ttl=64 time=3.62 ms
   
   --- node1-2.sb1.orbit-lab.org ping statistics ---
   1 packets transmitted, 1 received, 0% packet loss, time 0ms
   rtt min/avg/max/mdev = 3.624/3.624/3.624/0.000 ms

Now, you can write a simple ruby script to go out and pull the updated ns-3 code from the repository. Using your favorite editor, copy the following code into a file called "ns-3-prepare.rb": 

   Experiment.name = "ns-3-prepare"
   
   defGroup('server', [1,1]) { |node|
     node.image = "ns-3.5.ndz"
   }
   
   defGroup('client', [1,2]) { |node|
     node.image = "ns-3.5.ndz"
   }
   
   whenAllUp() { |node|
     allGroups.exec("/usr/local/bin/wlanconfig ath0 destroy")
     wait 2
     group("server").exec("/usr/local/bin/wlanconfig ath0 create wlandev wifi0 wlanmode ap")
     wait 2
     group("client").exec("/usr/local/bin/wlanconfig ath0 create wlandev wifi0 wlanmode sta")
     wait 2
     allGroups.exec("ifconfig ath0 promisc up")
     wait 2
     allGroups.exec("cd /home/repos/ns-3.3; hg pull http://code.nsnam.org/craigdo/ns-3.3-orbit; hg update; ./waf")
     wait 500
     Experiment.done
   }

   Sidebar:  Note the wait statements in the above code.  There is
   apparently no way to execute a command synchronously on multiple nodes
   using ORBIT tools.  Thus, we seem  faced with a tradeoff.  Either ssh
   into the nodes and perform the actions manually and synchronously,
   or automate them and possibly wait longer than absolutely necessary.
   It seems safe to control-C out of the script after the compilations
   are done.

2. Execute the ns-3-prepare.rb command script. 

   a.  orbit exec ns-3-prepare

   INFO init: NodeHandler Version 4.2.0 (1272)
   INFO init: Experiment ID: sb1_2009_01_12_20_34_55
   INFO Experiment: load system:exp:stdlib
   INFO prop.resetDelay: resetDelay = 210:Fixnum
   INFO prop.resetTries: resetTries = 1:Fixnum
   INFO Experiment: load ns-3-prepare
   INFO stdlib: Waiting for nodes (Up/Down/Total): 0/2/2 - (still down: n_1_2,n_1_1)
   ...
   INFO whenAll: *: 'status[@value='UP']' fires
   INFO whenAll: *: 'status[@value='UP']' fires
   INFO exp: Request from Experiment Script: Wait for 10s....
   Event DONE.OK (from /usr/local/bin/wlanconfig@n_1_2): status: 0
   Event DONE.OK (from /usr/local/bin/wlanconfig@n_1_1): status: 0
   INFO exp: Request from Experiment Script: Wait for 10s....
   ...
   INFO exp: Request from Experiment Script: Wait for 500s....
   Message (from cd@n_1_2):  pulling from http://code.nsnam.org/craigdo/ns-3.3-orbit
   Message (from cd@n_1_2):  searching for changes
   Message (from cd@n_1_2):  no changes found
   ...
   familiar waf output from ns-3
   ...
   Event DONE.OK (from cd@n_1_1): status: 0
   INFO Experiment: DONE!
   INFO ExecApp: Application 'commServer' finished
   INFO run: Experiment sb1_2009_01_12_20_34_55 finished after 10:35

Notice that this script has taken care of setting up the wireless devices for you.

Now you can run the example ns-3 client server scripts on the testbed. We have configured [1,1] device "ath0" as an access point, and [1,2] device "ath0" as a station. Both devices must be in promiscuous mode. This can all be verified by using "ifconfig" and "iwconfig" on the appropriate console.

This is annoying, but for now we have got to manually set the hardware address of the interfaces in the ns-3 simulation script.

3. Set the hardware address of the interface in the server script on node [1,1] 

   a. ifconfig

Locate the output for the device ath0 in the output of ifconfig 

       ath0      Link encap:Ethernet  HWaddr 06:60:b3:ac:2b:f5
                 inet6 addr: fe80::460:b3ff:feac:2bf5/64 Scope:Link
                 UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
                 RX packets:1728 errors:0 dropped:0 overruns:0 frame:0
                 TX packets:42 errors:0 dropped:0 overruns:0 carrier:0
                 collisions:0 txqueuelen:0
                 RX bytes:1769806 (1.6 MiB)  TX bytes:2216 (2.1 KiB)

Copy the HWaddr to the clipboard (in this case, 06:60:b3:ac:2b:f5) 

   b.  cd examples
   c.  emacs emu-udp-echo-server.cc     # or use your favorite editor

Search for the MAC address assigmnet and replace the string with the HWaddr you just found, for example, 

   ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("00:00:00:00:00:01")));

becomes 

   ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("06:60:b3:ac:2b:f5")))'

Save the changes and build 

   d.  cd ..
   e.  ./waf

4. Set the hardware address of the interface in the client script on node [1,2] 

   a. ifconfig

Locate the output for the device ath0 in the output of ifconfig 

       ath0      Link encap:Ethernet  HWaddr 06:60:b3:b0:c6:a4
                 inet6 addr: fe80::460:b3ff:feb0:c6a4/64 Scope:Link
                 UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
                 RX packets:72 errors:0 dropped:0 overruns:0 frame:0
                 TX packets:851 errors:0 dropped:0 overruns:0 carrier:0
                 collisions:0 txqueuelen:0
                 RX bytes:1900 (1.8 KiB)  TX bytes:890770 (869.8 KiB)

Copy the HWaddr to the clipboard (in this case, 06:60:b3:b0:c6:a4) 

   b.  cd examples
   c.  emacs emu-udp-echo-client.cc     # or use your favorite editor

Search for the MAC address assigmnet and replace the string with the HWaddr you just found, for example, 

   ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("00:00:00:00:00:01")));

becomes 

   ed->SetAddress (Mac48Address::ConvertFrom (Mac48Address ("06:60:b3:b0:c6:a4")))'


Save the changes and build 

   d.  cd ..
   e.  ./waf

In this simple example, we are just going to manually start one ns-3 simulation script to act as a server for a trivial UDP echo application. Once the server is started on [1,1] for example, you can then go to the console for [1,2] and run the UPD echo client script. Let's do it. Remember you don't have all day to dawdle after running the server -- it exits automatically after 60 seconds.

5. Run the server on [1,1] 

   a.  ./waf --run emu-udp-echo-server

6. Run the client on [1,2] 

   a.  ./waf --run emu-udp-echo-client

Congratulations, you have now run your ns-3 simulation scripts on a testbed. That was exciting, wasn't it.

You can now look at the trace files on the client [1,2] and server [1,1] nodes and see what you've done. For example, to look at the pcap traces on the client node:

7. Display the pcap trace on [1,2] 

   a. cd ..
   b. tcpdump -nn -tt -r emu-udp-echo-client-0-0.pcap  | more

Craigdo 19:30, 14 July 2009 (UTC)

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