OVS Controller not working

[Xenia Mountrouidou]

type of account: GENI portal
tool: Jacks
slice name: XDemoDDoS
aggregates Kentucky PKS2 InstaGENI
a detailed description of what's wrong including any error messages

The only traffic that I have ran is ping (no flooding traffic or anything like this). Initially, I was able to ping between nodes immediately after I reserved the topology, before I ran anything. Then I added ovs bridge br0 and all the eth interfaces of the nodes to the bridge and the controller to the ovs. I followed the OpenFlow tutorial instructions. The controller connects fine but now my nodes are not able to ping each other. I even tried to use another controller that I reserved in Utah DDC (slicename: XOpenFlow). This controller is exactly the one used in the openflow tutorial. Still no luck. My OVS is the image: Ubuntu 14 OVS by Niky. 

When I delete the bridge everything works fine and nodes can ping each other again.

Thanks,

Xenia

[Niky Riga]

Hi Xenia,

Can you please send us the topology you have? A screenshot from Jacks will do.

Some clarifying questions:
  * Are you sure all your nodes are on the same subnet? The usual controllers we are using are Layer 2 switches and do not perform routing.
  * Do you see the packet-ins coming on the controller (run the controller in verbose mode)?
  *  Can you do tcpdump on the relevant data interfaces (of the hosts and OVS switch) and track the packets?

Best,
Niky

Xenia Mountrouidou

December 1, 2015 at 5:42 PM

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[Xenia Mountrouidou]

Niky,

Thank you for the response! The problem was solved by putting the nodes in the same subnetwork.

On Thu, Dec 3, 2015 at 6:47 AM, Niky Riga <nr...@bbn.com> wrote:

Hi Xenia,

Can you please send us the topology you have? A screenshot from Jacks will do.

Some clarifying questions:
  * Are you sure all your nodes are on the same subnet? The usual controllers we are using are Layer 2 switches and do not perform routing.

I think this was the problem... I put the nodes in the same subnetwork and ping works again.

 

  * Do you see the packet-ins coming on the controller (run the controller in verbose mode)?

Yes, I did tcpdump -i eth0 tcp 6633 -vv on the controller and I see packets. 

--

Best regards,

Xenia Mountrouidou, Ph.D.
Assistant Professor, 

Department of Computer Science
Wofford College

http://www.wofford.edu/computerscience/

http://xeniamountrouidou.net/