[ovs-dev] NVGRE support in OVS

Farrukh Aftab Khan Farrukh.Khan at xflowresearch.com
Thu Oct 4 09:43:14 UTC 2012

Thanks for the time. I found my mistake. Without the use of a key to
differentiate between the two tunnels, so if you give a different key to
both tunnels, you can set up as many as you would want.

But I do still have this query of GRE handler. Can it only be invoked once?
I try to use it for NVGRE but so far, haven't really succeeded in doing


On Thu, Oct 4, 2012 at 11:26 AM, Farrukh Aftab Khan <
Farrukh.Khan at xflowresearch.com> wrote:

> Hey! Some help here would be appreciated. I am using OVS-1.7.1 on Ubuntu
> 11.10. I am trying to add support for NVGRE in OVS. I took a lot of help
> from Pravin Shelar's patch for 64bit GRE support.
> I had a couple of queries in this regard:
> 1) Is is possible to register more than one GRE handler? When I try to set
> up the NVGRE tunnel, it throws me an exception of: "Cannot register GRE
> handler". Since NVGRE is an extension to GRE, I am trying to register the
> same handler.
> 2) Is is even possible to set up more than one interface of type GRE? I
> tried to do that but somehow the 2nd one was not working.
> I tried using 'dmesg' but there were no handler issues in the 2nd
> scenario. Am I missing something regarding the intrinsic functionality of
> OVS? Any sort of heads up in this regard would be appreciated.
> Regards.
> --Farrukh
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