[ovs-discuss] Linking multiple VM with remote OVS

Jesse Gross jesse at nicira.com
Tue Sep 4 17:58:41 UTC 2012


On Tue, Sep 4, 2012 at 9:22 AM, Farrow, Paul <pwfarr at essex.ac.uk> wrote:
> Hi,
>
>
>
> I have OVS setup on a VM and it seems to be up and running without problems,
> the problem is I have several VM’s running on remote machines that I want to
> link into the OVS. I have tried so many things that I am almost giving up so
> would appreciate any help that people could give me.
>
>
>
> Here are the things I have tried:
>
> ---pptp vpn connection from remote VM to OVS VM and then adding the vpn
> interfaces into the OVS
>
> ---gre tunnel from remote VM into the OVS VM and adding the gre interface to
> OVS
>
> ---gre tunnel from remote VM but set up on OVS VM directly from OVS (using
> ovs-vsctl)
>
>
>
> I am out of options and have tried so many variations of the things above
> with no luck, I can ping IP’s before adding the interfaces to OVS so the
> tunnels seem to be working OK, but after adding the interfaces to OVS they
> don’t seem to want to do anything. I have floodlight running as the
> controller which picks up the switch but does not seem to discover any host
> machines. When using gre tunnels ifconfig shows packets being received at
> the OVS VM but they don’t seem to go anywhere or register anywhere else such
> as floodlight so not sure what’s happening as the tunnel is obviously
> working. I am wondering if OVS is adding the interfaces correctly?
>
>
>
> Any advice or help would be great as it is causing me a bit of a headache.

Two things that I would look at:
 * I suspect that the Linux GRE tunnels that you created are carrying
IP traffic, which would explain why you can ping but not use them with
OVS since OVS operates on Ethernet frames.
 * I would try it without Floodlight.



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