← Back to team overview

openstack team mailing list archive

Re: question on the GRE Communication


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.


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
>> _______________________________________________
>> Mailing list: https://launchpad.net/~openstack
>> Post to     : openstack@xxxxxxxxxxxxxxxxxxx
>> Unsubscribe : https://launchpad.net/~openstack
>> More help   : https://help.launchpad.net/ListHelp

Follow ups