[ovs-discuss] GRE support

Justin Pettit jpettit at nicira.com
Fri Jan 22 08:30:32 UTC 2010

Yes, if your kernel supports GRE tunnels and you create them externally with some program like "ip", you should be able to attach them as you would other system devices.  The support added to GRE does the following:

	- Ethernet over GRE was added to Linux 2.6.28, and it took a while before all the bugs were ironed out.  We've back-ported support and fixes all the way back to at least 2.6.18.

	- You can directly configure the GRE tunnels through OVS's configuration database.  This means that if you're using a remote configuration protocol like the one coming to OpenFlow (1.0.5?), you'll be able to remotely setup and configure your GRE tunnels.

We're also working on a few other improvements, such as support for PMTU.  The ones I listed above are what's immediately available in the "next" branch.


On Jan 22, 2010, at 12:21 AM, DarkBls wrote:

> Hi,
> I know that GRE is already there in the unstable branch and will be "available" (documented) in the stable branch within a couple of month.
> Can someone explain me what is the OvS support of GRE exactly ? Does'nt this already work ? :
> Server A with OvS (#1)
>      GRE tunnel to Server B displayed as gretapB
> Server B with OvS (#2)
>  GRE tunnel to Server A displayed as gretapA
> gretapA added ni OvS1 and gretapB added in OvS2
> Thank you for your explaination
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