[ovs-discuss] Question about Ethernet over GRE

Justin Pettit jpettit at nicira.com
Tue Oct 27 22:19:34 UTC 2009

Here's the commit that adds Ethernet over GRE encapsulation to Linux:


Once we have support for the feature, we'll add the appropriate  
documentation about how to configure it through OVS.


On Oct 27, 2009, at 2:27 PM, Huy Nguyen wrote:

> What is ethernet over GRE? Is it a different module than ip_gre? How  
> does one create a gre tunnel using this mechanism?
> Huy
> --- On Tue, 10/27/09, Justin Pettit <jpettit at nicira.com> wrote:
>> From: Justin Pettit <jpettit at nicira.com>
>> Subject: Re: [ovs-discuss] Question about Ethernet over GRE
>> To: "Huy Nguyen" <huy_nguyen at yahoo.com>
>> Cc: discuss at openvswitch.org
>> Date: Tuesday, October 27, 2009, 1:03 PM
>> On Oct 27, 2009, at 12:43 PM, Huy
>> Nguyen wrote:
>>> At the openvswitch main page, I saw this feature
>> mentioned as under development. How can I learn more about
>> this feature? Can someone point me to the new code or a
>> functional specs if available?
>> We are planning to implement this feature in the next
>> couple of weeks, so all the details have not fully been
>> worked out yet.  The rough plan is that an
>> administrator will be able to define a virtual port that
>> will define a GRE endpoint and key in the OVS configuration
>> file.  That virtual port can then be added to an OVS
>> bridge over which Ethernet frames will be sent and
>> received.
>>> On Linux, packet coming from a gre tunnel interface
>> does not have a real MAC header. I'm curious of what is the
>> plan to be able to bridge gre tunnel interfaces if that is
>> what being developed?
>> Support for Ethernet over GRE tunnels was added to Linux
>> 2.6.28.  I haven't had a chance to play with them yet,
>> but I would expect the frames to be able to just be sent and
>> received over the interface that is created when the GRE
>> tunnel is created by OVS.
>> --Justin

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