= '''Under Construction''' =

= GEC11 !NetServ tutorial: step-by-step instruction =

== Preparation ==

1. Start the GEC11 VM and login as the "GENI User".

2. Open Firefox and point it to the following URL:

  [http://pc517.emulab.net/visual/index.html?id=50]

  ''Please note that you must replace "50" with your own user number throughout this tutorial.''

3. You will see the traffic visualization in your browser as follows:

  [[Image(traffic.jpg, 300px)]]
  
== Install !NetServ module ==

1. Open a terminal window and go to your !NetServ user directory.

{{{
cd /netserv-root/tutorial/user50
ls -l
}}}

2. The following files have been prepared for each user:

{{{
Makefile
NetServ/Example.java
example.mf

upload.sh
setup.sh
remove.sh

setup-request-1.txt
setup-request-2.txt
setup-request-3.txt
remove-request.txt

request-signer
private-key-50.pem
public-key-50.pem
}}}

3. Build the Example module and upload it to the !NetServ repository.

{{{
make
./upload.sh
}}}

4. Send a SETUP message to the !NetServ router to install the module.

  While you are watching the browser window type the following command into the terminal window.

{{{
./setup.sh 1
}}}

  The traffic will be redirected to D2 (the node on the lower right) and !NetServ.Example will be added to the list of !NetServ modules currently installed.

5. The SETUP message looks like this:

{{{
$ cat setup-request-1.txt 
SETUP NetServ.Example_1.0.0 NETSERV/0.1
url: http://pc487.emulab.net/modules/user50/example.jar
user: user50
ttl:  600
filter-ipv4: 10.10.2.2
filter-proto: udp
filter-port: 20050
properties: debug = false, ip = 10.10.3.2

}}}

6. Send a REMOVE message to the !NetServ router to remove the module.

{{{
./remove.sh
}}}

7. The REMOVE message looks like this:

{{{
$ cat remove-request.txt 
REMOVE NetServ.Example_1.0.0 NETSERV/0.1
user: user50

}}}

== Develop !NetServ module ==

1. Open {{{Example.java}}} with gedit or your favorite editor.

{{{
gedit NetServ/Example.java &
}}}

  {{{Example.java}}} is a typical !NetServ packet processing module and it extends the !NetServ.!BuildingBlock.service.!PktProcessorActivator class.

2. Modify {{{Example.java}}}.

  Comment out processPkt() marked as scenario !#1, and uncomment processPkt() scenario !#2.

3. Compile and upload the new version of the module.

{{{
make
./upload.sh
}}}

4. While you're watching the browser screen, install the module into the !NetServ router with the following command.

{{{
./setup.sh 2
}}}

  Note that the "2" argument will make the script send {{{setup-request-2.txt}}}, which includes two IP addresses in the properties header.

{{{
$ cat setup-request-2.txt 
SETUP NetServ.Example_1.0.0 NETSERV/0.1
url: http://pc487.emulab.net/modules/user50/example.jar
user: user50
ttl:  600
filter-ipv4: 10.10.2.2
filter-proto: udp
filter-port: 20050
properties: debug = false, ip = 10.10.2.2  10.10.3.2

}}}

5. Update the module properties by sending another SETUP message.

  By sending a SETUP message for a module that is already installed, you can update its properties and refresh its TTL.
  
  Try sending {{{setup-request-3.txt}}} to the !NetServ router:

{{{
./setup.sh 3
}}}

  This SETUP request contains a non-existing IP address as the packet destination, which will make the !NetServ node drop the incoming packets.

==  ==