[ovs-discuss] Re : Re : ip_gre_mod.ko module

DarkBls darkbls at yahoo.com
Fri Jun 25 13:03:25 UTC 2010

Il fix the problem, thank you for your help. I gave another IP / physical interface for the tunnel.

I still have some questions about GRE Tunneling.

For now I have:

On phosphorus (eth0: / eth1:
br0 (tap0 + gre0 ->

On sulphur: (eth0: / eth1:
br0 (tap0 + gre0 ->

A VM on phosphorus can ping a Vm on sulphur through the GRE tunnel.

What if I want to make several br (br1, br2 and br3) on phosphorus and I want them to be connected through their own GRE tunnel on their sulphur counterpart (br1, br2 and br3) only ?

De : Jesse Gross <jesse at nicira.com>
À : DarkBls <darkbls at yahoo.com>
Cc : Justin Pettit <jpettit at nicira.com>; discuss at openvswitch.org
Envoyé le : Mar 22 juin 2010, 0h 01min 22s
Objet : Re: [ovs-discuss] Re : ip_gre_mod.ko module

On Mon, Jun 21, 2010 at 3:47 AM, DarkBls <darkbls at yahoo.com> wrote:
>ovs-vsctl --db=tcp: create interface name=gre0 type=gre options:remote_ip=
>>ovs-vsctl --db=tcp: create port name=gre0 interfaces=[e29c391b-2e07-4a2e-95de-99cf6f23158d]
>>ovs-vsctl --db=tcp: 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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