Finally, hard work paid off. I was troubleshooting with wireshark and could observe receiving NetFlow data (cflow) on the collector VM. Also, observed that the port 2055 was giving "destination unreachable (port unreachable)" error.
I changed the NetFlow port to 2100 on openvswitch but then didn't observe any NetFlow data on wireshark. I checked with my NetFlow collector and could see the incoming data. Phew! No cflow data on wireshark, but I'm getting it on my collector. That's pretty weird! Anyways, thanks a lot Ben for your patience! :-) On Fri, May 20, 2016 at 6:59 PM, Ben Pfaff <b...@ovn.org> wrote: > 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 <b...@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 <b...@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)? > > > > > > > > > > > > > > >
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