[ovs-discuss] openvswitch gre tunneling issues

[Gurucharan Shetty]

On Mon, Mar 31, 2014 at 8:36 AM, Shiva <shivaramakrishnan740 at gmail.com> wrote:
> Hello,
>
> I am setting up two gre tunnels between two hosts using the same external
> bridge.In this case (br1).I use virbr3 and virbr2 for internal
> communication.
>
> This is my config steps:
> Hypervisor 1:
> External communication
> ovs-vsctl add-br br1
> ovs-vsctl add-port eth0
> ifconfig br1 p.q.r.s netmask 255.255.255.0
>
> Internal bridge for vm communication
> Tunnel1 :
>
> ovs-vsctl add-br virbr3
> ovs-vsctl show
> ovs-vsctl add-port virbr3 gre2 -- set interface gre2 type=gre
> options:remote_ip:a.b.c.d
>
> Tunnel2:
>
> ovs-vsctl add-br virbr2
> ovs-vsctl show
> ovs-vsctl add-port virbr2 gre0 -- set interface gre0 type=gre
> options:remote_ip:a.b.c.d
Consider the case for the traffic coming into Hypervisor1. I don't
think it is possible to figure out which of the two end points the
packet needs to be delivered to because the 2 gre tunnels are not
unique.

I think if you delete one of your virbr* in each of the machines, you
should be able to communicate.


>
>
> Hypervisor 2:
> External communication
> ovs-vsctl add-br br1
> ovs-vsctl add-port eth0
> ifconfig br1 a.b.c.d netmask 255.255.255.0
>
> Internal bridge for vm communication
>
> Tunnel1:
>
>
> ovs-vsctl add-br virbr3
> ovs-vsctl show
> ovs-vsctl add-port virbr3 gre2 -- set interface gre2 type=gre
> options:remote_ip:p.q.r.s
>
> Tunnel2:
>
> ovs-vsctl add-br virbr2
> ovs-vsctl show
> ovs-vsctl add-port virbr3 gre0 -- set interface gre0 type=gre
> options:remote_ip:p.q.r.s
>
>
> I am not able to communicate outside world from the vm's.I am just able to
> reach the host on which vm resides and viceversa.Can you please let me know
> what am i missing here?
>
> Your help in this regard is greatly appreciated.
>
>
> _______________________________________________
> discuss mailing list
> discuss at openvswitch.org
> http://openvswitch.org/mailman/listinfo/discuss
>