[ovs-discuss] Testing GRE Tunneling in OVS

[Ben Pfaff]

Those flows don't output to the tunnel, they input from it.  You can't
expect to receive traffic from a tunnel if nothing ever sends traffic
on it.

On Wed, May 06, 2015 at 02:00:22PM -0400, Venkata Ravichandra Cherukuri wrote:
> Please correct me if I am wrong.
> 
> I have added flows already ( sorry for not mentioning it earlier.)
> 
> S1:
> ovs-ofctl add-flow br0 in_port=1,actions=output:2 (where my logical port 1
> is gre0 and logical 2 is eth1).
> 
> S2:
> ovs-ofctl add-flow br0 in_port=1,actions=output:2 (where my logical port 1
> is gre0 and logical 2 is eth1).
> 
> I am sure that this is not the perfect flow but this should atleast give me
> partial result when I analyze the pcap.
> 
> Thanks for the quick revert.
> 
> 
> Best Regards,
> Venkata Ravichandra Cherukuri,
> Student, MS in Computer Networks,
> North Carolina State University, Raleigh, NC.
> +1 919 590 2168
> 
> On Wed, May 6, 2015 at 1:48 PM, Ben Pfaff <blp at nicira.com> wrote:
> 
> > That doesn't direct traffic into the tunnel.
> >
> > You would normally use an OpenFlow flow to direct traffic to the tunnel.
> >
> > On Wed, May 06, 2015 at 01:45:21PM -0400, Venkata Ravichandra Cherukuri
> > wrote:
> > > Hi Ben,
> > >
> > >     I have used normal "ping" to generate traffic.
> > >
> > > From S1 I tried to ping S2 using "ping 192,168.1.1"
> > >
> > > Best Regards,
> > > Venkata Ravichandra Cherukuri,
> > > Student, MS in Computer Networks,
> > > North Carolina State University, Raleigh, NC.
> > >
> > > On Wed, May 6, 2015 at 1:41 PM, Ben Pfaff <blp at nicira.com> wrote:
> > >
> > > > On Wed, May 06, 2015 at 01:32:07AM -0400, Venkata Ravichandra Cherukuri
> > > > wrote:
> > > > > Hi all,
> > > > >
> > > > >     I have configured GRE Tunnel between two switches using the
> > following
> > > > > command. The simulator that I am using is GENI hence, I won't be
> > able to
> > > > > use the eth0 interface.
> > > > >
> > > > > S1 (eth1 192.168.1.10/24) ---------- S2 (eth1 192.168.1.1/24)
> > > > >
> > > > > S1 Configuration:
> > > > >
> > > > > /* (For OVS Installation) */
> > > > > apt-get install openvswitch-switch
> > > > > apt-get update
> > > > >
> > > > > /* (For GRE Tunnel Creation) */
> > > > > ovs-vsctl add-br br0
> > > > > ovs-vsctl add-port br0 gre0 -- set interface gre0 type=gre
> > > > > options:remote_ip=192.168.1.1
> > > > >
> > > > > S2 Configuration:
> > > > > apt-get install openvswitch-switch
> > > > > apt-get update
> > > > > ovs-vsctl add-br br0
> > > > > ovs-vsctl add-port br0 gre0 -- set interface gre0 type=gre
> > > > > options:remote_ip=192.168.1.10
> > > > >
> > > > > After completion I have tried pinging the two switches and they are
> > able
> > > > to
> > > > > communicate successfully but when I take the pcap file of the
> > > > communication
> > > > > between the switches (tcpdump -i eth1 -w testing.pcap) *I am not
> > able to
> > > > > see the GRE encapsulation over packets. *I have used wire-shark to
> > > > analyze
> > > > > the packets.
> > > >
> > > > What did you use to direct traffic into the tunnels?
> > > >
> >