[ovs-discuss] can not create device problem

[Jesse Gross]

On Sat, Jun 19, 2010 at 2:12 AM, Yan <yan.p.bjtu at gmail.com> wrote:

> Hi Jesse,
> I want to try GRE tunnel with OVS, and I follow the instruction here
> http://www.mail-archive.com/discuss@openvswitch.org/msg00356.html
> I unloaded ip_gre, however it doesn't work.
> since I have two nic in my machine with different IP so do i have
> to specify a local_ip?
>

Can you please cc the list when sending messages?  That way it can
potentially help other people.

You only need to specify local_ip if you are trying to distinguish two
tunnels that are otherwise the same.  Not specifying it will cause all
packets to be accepted by a particular tunnel.


>
> When I add a common interface into bridge I can see a msg from nox like
> |DBG:received port status event from 00ff002799f2
> But when I add a GREtap to bridge nothing can be seen.
>

When you say GREtap do you mean Linux GRE devices?  Those are not supported.
 When you use OVS GRE the type is simply "gre".


>  i want to know that does vswitchd deamon monitor the gre tunnel traffic
> from a physical interface since you mentioned that it is no longer necessary
> to load OVS GRE module.
>

It doesn't directly pull GRE traffic off the physical interface - OVS still
registers a protocol handler with the Linux IP stack for GRE.  The reason
why you no longer need to load a separate module is that GRE has been
directly integrated into the main openvswitch_mod.


> Would you please give more details about OVS's GRE?
>

If you are still having problems please post the exact commands you are
using and the output.
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