[ovs-discuss] Single Bridge GRE Tunnel Not Working

[Jesse Gross]

The physical interface used to send the encapsulated packets should
not be a member of the bridge that is generating the GRE packets.
Since the packets are egressing using the IP stack, this interface
needs an IP address.

On Mon, Aug 19, 2013 at 7:43 PM, Dmita Levy <dlevy022 at fiu.edu> wrote:
> Hello Jesse,
>
> Thank you for your response. I am replying a month later because we are
> finally moving on to the testing phase of our GRE tunneling solution and
> getting our testbed setup and configured correctly is turning out to be a
> learning experience in itself. In your response below, are you saying that
> eth0 should have an IP address and the tunnels should point to that IP? If
> so, a number of the tutorials online say to give the bridge an IP and leave
> the Ethernet interface blank...so its a bit confusing.
>
>
> On Mon, Jul 29, 2013 at 8:23 PM, Jesse Gross <jesse at nicira.com> wrote:
>>
>> On Mon, Jul 29, 2013 at 5:02 PM, Dmita Levy <dlevy022 at fiu.edu> wrote:
>> >
>> > Hello,
>> >
>> > I have attached an image of a simple GRE tunnel that I am testing below
>> > but I am unable to figure out why it will not work. The setup is one host
>> > with one bridge (bridge0), directly connected to another host with one
>> > brige. A GRE tunnel has been specified in OVS with the adjacent bridge as
>> > the remote IP. Assuming this is correct, why are the packets (ping etc.)
>> > that are sent between the host not encapsulated in GRE but ARP, Multicast
>> > etc are encapsulated?
>>
>> The remote IP address of the tunnel should not be pointing at the
>> bridge interface that the tunnels are connected to. It needs to be the
>> IP address of the physical interfaces in the system, otherwise packets
>> won't actually be able to ingress into the bridge.
>
>