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Re: question on the GRE Communication


Thanks Logan

On Thu, Mar 14, 2013 at 7:16 PM, Logan McNaughton <logan@xxxxxxxxxxxx>wrote:

> 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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