[ovs-discuss] Re : ip_gre_mod.ko module

Jesse Gross jesse at nicira.com
Mon Jun 21 22:01:22 UTC 2010


On Mon, Jun 21, 2010 at 3:47 AM, DarkBls <darkbls at yahoo.com> wrote:
>
> ovs-vsctl --db=tcp:192.168.93.201:1977 create interface name=gre0 type=gre
> options:remote_ip=192.168.93.204
> e29c391b-2e07-4a2e-95de-99cf6f23158d
> ovs-vsctl --db=tcp:192.168.93.201:1977 create port name=gre0
> interfaces=[e29c391b-2e07-4a2e-95de-99cf6f23158d]
> 01c689e2-ecab-4ee6-8902-6aba2efe2deb
> ovs-vsctl --db=tcp:192.168.93.201:1977 add bridge br0 ports
> 01c689e2-ecab-4ee6-8902-6aba2efe2deb
>

All this looks fine.


>
> I must have missed something since I don't see any port 47 opened on any
> server
>

GRE runs over IP protocol 47, not TCP or UDP port 47 so you won't see it
listed  in netstat -l.

Since a flow is being setup that is sending traffic to the GRE port the
configuration should be fine.  Can you do a tcpdump on the physical
interface to see if there is GRE traffic?  Is it possible that something
like iptables is blocking GRE traffic?
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