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List:       openvswitch-discuss
Subject:    [ovs-discuss] Unable to make Netflow v5 working
From:       bachhaduy () gmail ! com (Duy Bach Ha)
Date:       2014-07-29 15:10:49
Message-ID: 53D7B979.8000904 () gmail ! com
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Hello,

Just to sum up and ask for help since I'm doing a thesis and have stuck 
here for a long time. You guys don't have to follow the other 2 emails 
because I sum all here. Sincerely thanks for your support.

Experimental mininet 2.1.0 network of 6 ovs switches 2.1.2 and some 
hosts (with ip in 192.168.1.0/24) and try to deploy Netflow on the 
switches. The controller is opendaylight.

/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/

Try ping, udp client and server, but netflow is not working. I installed 
from apt-get so most likely I'm working in userspace mode. I tried 
compiling kernel module, but the switch crashes when I install netflow 
command. (ovs-vswitchd crashed with SIGSEGV in xlate_actions_() ). I ran 
the testsuites before install and all tests are successful.

My questions:
1 - If the netflow configuration is wrong, please point out for me. Or 
if my concept of "what a flow is" 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 version, ovs version and gcc version? 
I have both 12.04 and 14.04 ubuntu and I can manage to downgrade my 
kernel version.

Best regards,
Duy

On 07/27/2014 04:01 PM, Duy Bach Ha wrote:
> Hello,
>
> An update on the matter, I discovered that the cause of my crashing is 
> not from connecting to the controller, but because of this command:
>
> /sh ovs-vsctl -- set Bridge s1 netflow=@nf -- --id=@nf create NetFlow 
> targets=\"192.168.1.2:5566\" active-timeout=10/
>
> I'm on ovs 2.1.2, linux kernel version 3.11 and is working with kernel 
> module I compiled with gcc 4.7. At first I thought it is because of 
> the controller, but actually it's not. The moment I add NetFlow 
> configuration, the switch crashed, than come back again, then crash 
> again, infinitely. However, in the testsuite, tes-netflow just run 
> successfully.
>
> /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/
>
> This is syslog:
>
> /Jul 27 15:35:48 LilBao ovs-vsctl: ovs|00001|vsctl|INFO|Called as 
> ovs-vsctl -- set Bridge s1 netflow=@nf -- --id=@nf create NetFlow 
> "targets=\"192.168.1.2:5566\"" active-timeout=10//
> //....//
> //Jul 27 15:35:49 LilBao kernel: [  241.781970] ovs-vswitchd[1738]: 
> segfault at 10 ip 0000000000431469 sp 00007fff8fb8c500 error 4 in 
> ovs-vswitchd[400000+141000]//
> //....//
> //Jul 27 15:35:50 LilBao ovs-vswitchd: ovs|00002|daemon(monitor)|ERR|1 
> crashes: pid 1738 died, killed (Segmentation fault), core dumped, 
> restarting//
> //.... and then after that the log of the restart of all switches/
>
> So again, I hope you guys can give me suggestion on my 3 questions 
> that I previously asked:
> 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?
>
> Thank you so much,
> Duy
>
> On 07/26/2014 05:16 PM, Duy Bach Ha wrote:
>> 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

-- 
-------------------
Bach Ha Duy
INFOTECH Master Program
University of Stuttgart, Germany
Filderbahnplatz 31, 70567 Stuttgart/Mohringen
Flat 01 Room No. 03
0152 59757763

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