[ovs-discuss] Unable to make Netflow v5 working

[Duy Bach Ha]

Hi all,

I'm running an experimental mininet network of 6 ovs switches and some 
hosts (with ip in 192.168.1.0/24) and try to deploy Netflow on the 
switches. The controller I'm using is opendaylight. So for example:

/sudo mn --switch ovsk --controller remote --custom /smile/ncstestmap.py 
--topo ncstestmap --arp/
/sh ovs-vsctl -- set Bridge s1 netflow=@nf -- --id=@nf create NetFlow 
targets=\"192.168.1.2:5566\" active-timeout=10/

Everything went fine, I can check with ovs-vsctl list NetFlow or list 
Bridge and the configuration is there.

My purpose is just to use wireshark to see on (for example) all s1 
interfaces the Netflow (cflow in wireshark) packets coming to the 
destination. I first try it with ping and then with udp client and 
server. All shows up on wireshark. (According to wiki, netflow v5 also 
consider ping as a flow). But no netflow report is coming out. In 
/var/log/openvswitch/ovs-vswitchd.log, no collector failure or something 
like that is showing.

I have tried downgraded to kernel version to 3.11.10 (with headers 
installed) and compiled a kernel module for 2.1.2 with gcc 4.7 (which is 
the one used to compile 3.11.10 for ubuntu). But the switches just 
crashed at the moment it connect to the controller. Sometimes at the 
first run after compilation work, it works and the next restart it does not.

/2014-07-26T14:23:31.315Z|00017|daemon(monitor)|WARN|9 crashes: pid 6215 
died, killed (Segmentation fault), core dumped, waiting until 10 seconds 
since last restart//
//2014-07-26T14:23:41.315Z|00018|daemon(monitor)|ERR|9 crashes: pid 6215 
died, killed (Segmentation fault), core dumped, restarting/

I search harder and haven't get any idea what is wrong with my 
configuration. So here is my questions:

1 - If the netflow configuration is wrong, please point out for me. Or 
if my concept is wrong, please. :)
2 - Do netflow require a kernel module or just user space is enough?
3 - If a kernel module is required, so can you suggest me with the good 
version combination between kernel, ovs and gcc?

Best regards,
Duy

-- 
-------------------
Bach Ha Duy
INFOTECH Master Program
University of Stuttgart, Germany

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