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= TCP Experiment =

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<h3 align="left"> <u>Overview: </u> </h3>
In this experiment you will learn how to set up static routing with the <em>route</em> command. We will use the following network topology for this experiment:
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<img border="0" src="http://groups.geni.net/geni/attachment/wiki/GENIEducation/SampleAssignments/TcpAssignment/TCPAssignment.png?format=raw" alt="TCP topology"  align="center" width="350" title="route topology" /> 
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<h3 align="left"> <u>Prerequisites: </u></h3>
This tutorial expects that you have completed <b>lab 0</b> and know how to create a new sliver with an existing rspec. If you have not completed <b>lab 0</b> please do that first. </td>
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<h3 align="left"> <u>Tools: </u></h3>
All the tools will already be installed at your nodes.</td>
 <td> <pre>   </pre> </td>
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    <h3 align="left"> <u>Where to get help: </u></h3>
      For any questions or problem with the tutorial ask your TA or Professor for help. If a GENI tool is not working correctly please email <a href="mailto:help@geni.net?Subject=Help%20with%20ECE375%20tutorial"> help@geni.net </a>
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= Set Up =

If you are using Portal, create a sliver with the {{{tcp-openvz}}} rspec on InstaGENI. For ExoGENI, download the rspec [http://www.gpolab.bbn.com/experiment-support/TCPExampleExperiment/tcp-pc.rspec here] and specify {{{-a eg-gpo}}} in {{{omni}}} to specify which aggregate manager to use.

'''Note: when you try to login the nodes, you might encounter errors like the following: '''
{{{
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
12:3b:a0:19:db:b8:62:46:5d:a3:e2:06:27:eb:de:e2.
Please contact your system administrator.
Add correct host key in /Users/shuang/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/shuang/.ssh/known_hosts:20
RSA host key for 192.1.242.65 has changed and you have requested strict checking.
Host key verification failed.
}}}
This type of error happens when you have previously logged in a machine with the same IP address and that machine happens not to be the same one as the VM you want to log in. [[BR]]
As a result, this error might happen a lot, especially if you have done experiments on ExoGENI before (since it always uses the same IP range for its VMs and each VM is different from each other, i.e., with different RSA keys). [[BR]]
In this case, simply open ''~/.ssh/known_hosts'' and remove the line corresponding to the IP address you are trying to login. In our case here, find ''192.1.242.65'' and remove that line. [[BR]]
'''Note that the nodes are ready to login does not mean the interfaces are up and well configured. Users may need to wait for up to 5 minutes after nodes are up. '''