openstack team mailing list archive

[Logan McNaughton <logan@xxxxxxxxxxxx>]

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,
192.168.1.1-3). 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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