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Re: question on the GRE Communication


I'm not sure about verifying the GRE tunnels, so I can't be much help there.

As far as understanding how the tunneling happens, GRE is an open protocol,
not specific to OpenStack, or any vendor, and googling GRE should give you
plenty of information about it.
On Mar 14, 2013 5:21 AM, "Aru s" <arumon82@xxxxxxxxx> wrote:

> Hi  Logan,
> Thanks for the reply. I have one more question.
> How we will check whether the tunneling is established or not?
> I have gone through lot of documents of gre setup and all are says that
> the "ovs-vsctl show" command will show the tunnel info.
> Also is there a doc to understand how the magic happens for tunneling.
> Regards,
> Arumon
> On Tue, Mar 12, 2013 at 6:23 PM, Logan McNaughton <logan@xxxxxxxxxxxx>wrote:
>> For Quantum GRE tunneling, the network node and compute nodes need a NIC
>> on your data network. You assign each of those NIC's an IP (for instance,
>> Then (assuming you are using openvswitch with GRE
>> tunneling) you set up your quantum configs. Look at the Quantum
>> administration guide for an example of GRE tunneling with openvswitch.
>> After that you just let it work its magic. All VM traffic is encapsulated
>> inside GRE packets traveling between the nodes, it'll all look like packets
>> in that 192.168.1-3 network.
>> Once the packet reaches its destination node, the GRE encapsulation is
>> removed and the VM packet is read.
>> On Mar 12, 2013 6:36 AM, "Aru s" <arumon82@xxxxxxxxx> wrote:
>>>  Hi,
>>> I am trying to configuring openstack with one controller and one network
>>> and two compute nodes.
>>> I am not able to understand how the communication of the VM's happens
>>> which are for the same tenant with same ip range but on the different
>>> compute hosts.
>>> Please help me to understand how GRE communication happens.
>>> Regards,
>>> Arumon
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