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dlinknctu / OpenNet

A Simulator for Software-Defined Wireless Local Area Network
GNU General Public License v2.0
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wifi-roaming.py #112

Open dside99 opened 7 years ago

dside99 commented 7 years ago

Hello,

Running wifi-roaming.py I realized that controller doesn't exist in the simulation. So, I uncommented the relative lines but the controller still doesn't exist in the simulation. Is there any solution?

Thank you.

charlesmcchan commented 7 years ago

The controller is external to the simulation environment. You need to setup the controller separately. Any controller should work as long as they speak OpenFlow and is reachable from the physical machine you are running OpenNet.

dside99 commented 7 years ago

I understand that in this simulation there isn't any controller. So, the experiment using 7 APs and 2 hosts is not about sdn, isn't it? If yes, why the first ping is takes so many times longer than the second? Is there any example to completelly understand what I have to do to add the controller in the simulation?

Thank you in advance!

charlesmcchan commented 7 years ago

It is definitely SDN. However, the controller is not a simulated node running inside OpenNet. You need to prepare a real OpenFlow controller and connect your simulated switches to it.

Some controller, such as ONOS, can be run inside a Mininet environment. However, I don't think there is an existing example for doing this in OpenNet. You might need to develop your own.

dside99 commented 7 years ago

It's nice idea to contribute on your project. I saw this problem on all mininet examples running OpenNet. But let me ask you why it is SDN, because I think SDN requires a controller conected to Openflow switches to populate the the flow entries etc...

kansokusha commented 7 years ago

Since we noticed that some users do not know how to launch SDN controller when they trying to run our example scripts, the fail mode of all emulated OpenFlow switches in the script are set to standalone. User can run these scripts with/without SDN controller.

For more detail about fail mode, please refer OpenFlow Switch Specification.

For users who want to use SDN controller in OpenNet script, they can start from reading Mininet tutorial, the approach of adding SDN controller in OpenNet script is the same as Mininet.

dside99 commented 7 years ago

Actually, I can't totally understand you. I realize that the OpenFlow switch turns into standalone mode in order to deal without controller. Sure, I have to study about fail mode and Mininet tutorial. I supposed that Mininet examples could be executed in OpenNet enviroment, but they failed due to controller absence.