[ovs-discuss] Collecting NetFlow data

[Ben Pfaff]

Yes, that's how UDP works.

On Fri, May 20, 2016 at 05:40:34PM +0200, Syed Faraz Ali wrote:
> The connection is established even when the other machine is offline. Is it
> still normal?
> 
> # netstat -an | grep 2055
> udp        0      0 192.168.56.104:49403    192.168.56.103:2055
> ESTABLISHED
> 
> # ping 192.168.56.103
> PING 192.168.56.103 (192.168.56.103) 56(84) bytes of data.
> From 192.168.56.104 icmp_seq=1 Destination Host Unreachable
> From 192.168.56.104 icmp_seq=2 Destination Host Unreachable
> From 192.168.56.104 icmp_seq=3 Destination Host Unreachable
> ^C
> --- 192.168.56.103 ping statistics ---
> 5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4024ms
> pipe 3
> 
> 
> 
> On Fri, May 20, 2016 at 5:22 PM, Ben Pfaff <blp at ovn.org> wrote:
> 
> > It seems OK.
> >
> > When I use a similar configuration, I see an appropriate line in
> > "netstat -an" output:
> >
> > udp        0      0 192.168.42.143:52897    192.168.56.103:2055
> >  ESTABLISHED
> >
> > Do you get anything like that?
> >
> > On Fri, May 20, 2016 at 05:11:07PM +0200, Syed Faraz Ali wrote:
> > > >OVS isn't even opening a UDP socket.  What's in your database--can you
> > > >send along /etc/openvswitch/conf.db (or whatever file you're using)?
> > >
> > > I configured 192.168.56.103:2055 for NetFlow.
> > >
> > > Kindly check the attached file.
> > >
> > > On Fri, May 20, 2016 at 4:56 PM, Ben Pfaff <blp at ovn.org> wrote:
> > >
> > > > On Fri, May 20, 2016 at 12:50:13PM +0200, Syed Faraz Ali wrote:
> > > > > > It's probably easier to debug if you only enable NetFlow for now.
> > > > >
> > > > > Only NetFlow has been enabled.
> > > > >
> > > > > > Next, I'd use "strace" to see whether ovs-vswitchd is really
> > trying to
> > > > > > send data to the collector.  It would be using the "send" system
> > call.
> > > > >
> > > > > Please have the output of "strace ovs-vswitchd" in the attachment.
> > > >
> > > > OVS isn't even opening a UDP socket.  What's in your database--can you
> > > > send along /etc/openvswitch/conf.db (or whatever file you're using)?
> > > >
> >
> >
> >