[pox-dev] POX on planetlab

Thu May 2 01:43:46 PDT 2013

I guess the problem is caused by fail_mode of Open vSwitch configuration.

Have you ever checked the fail_mode configuration? Was it secure or
standalone?

On Thu, May 2, 2013 at 4:18 PM, Kouvakas Alexandros <questalex at gmail.com>wrote:

> The problem in my case is that even 1-2 minutes after having stopped the
> POX controller, I still have pings. Despite the fact that there are no
> flows in the flow table, I still have pings.
> In order to stop having pings I need to delete the bridge from the switch
> and recreate it again.
>
>
> 2013/5/1 Sayed Qaiser Ali Shah Shah <11msitqshah at seecs.edu.pk>
>
>> Well i am not sure what is the problem but I tried it as below and it
>> worked fine for me
>> start controller:
>>
>> cd pox
>> sudo ./pox.py forwarding.l2_learning
>>
>> it started controller. After that I created topology in another terminal
>> using command
>> sudo mn --topo single,4 --mac --controller remote
>>
>> This command created topology with one switch and 4 hosts.
>> Then by command  "xterm s1" I open switch s1 in xterm. I checked entries
>> via command
>> ovs-ofctl dump-flows s1
>> There were no flows in switch.
>> Then I ping host h2 from h1 in terminal of Mininet
>> h1 ping -c10 h2
>> The ping was successful and when I checked switch there were flow
>> entries. When I shutdown controller and ping hosts, switch still was having
>> flow entries for about 10 to 15 seconds. The ping worked for that time  but
>> after that time ping stopped because flow entries were deleted
>> automatically.
>> If you want to confirm that you need to check flow entries within 10-15
>> seconds when you stop controller, you will get flow entries but after about
>> 15 seconds ping will stop and there will be no flow entries in switch.
>>
>>
>> On Tue, Apr 30, 2013 at 1:44 PM, Kouvakas Alexandros <questalex at gmail.com
>> > wrote:
>>
>>> The weird thing is that:
>>> Before starting POX, I delete the flows from the switch with ovs-ofctl
>>> del-flows.
>>> After that, I cannot have pings.
>>> I start POX with l2_learning, and everything it's ok, I have pings.
>>> The flows are deleted after the timeout.
>>> I close POX.
>>> I can still have pings until I shutdown the ovs servers etc. When I type
>>> ovs-ofctl dump-flows, there are no flows on the switch but I can have
>>> pings.. I cannot understand  why that happens.
>>>
>>>
>>> 2013/4/29 Sayed Qaiser Ali Shah Shah <11msitqshah at seecs.edu.pk>
>>>
>>>>
>>>> You can check flow in OVS by the following command in xterm of OVS
>>>> ovs-ofctl dump-flows.
>>>> It will show you all the flows in switch which were added.
>>>>
>>>>
>>>>> Date: Mon, 29 Apr 2013 01:07:46 -0700
>>>>> From: Murphy McCauley <murphy.mccauley at gmail.com>
>>>>> To: Kouvakas Alexandros <questalex at gmail.com>
>>>>> Cc: pox-dev at lists.noxrepo.org
>>>>>
>>>>> Subject: Re: [pox-dev] POX on planetlab
>>>>> Message-ID: <C3DDA222-C02A-4009-8BFA-E9624EA35133 at gmail.com>
>>>>> Content-Type: text/plain; charset="iso-8859-1"
>>>>>
>>>>>
>>>>> (Inline)
>>>>>
>>>>> On Apr 29, 2013, at 12:56 AM, Kouvakas Alexandros wrote:
>>>>>
>>>>> > Sorry for asking again.Does anybody knows the answer on the above
>>>>> question?
>>>>>
>>>>> Sorry; I've been busy.  Hopefully this brief reply will be helpful.
>>>>>
>>>>> > 2013/4/23 Kouvakas Alexandros <questalex at gmail.com>
>>>>> > Hello,
>>>>> > I managed to create my network as I would like it to be.
>>>>> > So, I have one OVS and two hosts connected to it through tunnels.
>>>>> > Before running the POX controller I delete the flows of the OVS with
>>>>> "ovs-ofctl del-flows".So, after that I cannot have pings between the
>>>>> machines.
>>>>>
>>>>> As a note, POX clears the tables as soon as switches connect by
>>>>> default.
>>>>>
>>>>> > After that I run the pox controller with the module of l2_learning,
>>>>> so I have new flows and I have pings.
>>>>> > How can I check the flows that are now added  in the flow table?
>>>>>
>>>>> If you want to do it from within POX, send a flow stats request.
>>>>>  There's some info on the POX manual wiki:
>>>>>
>>>>> https://openflow.stanford.edu/display/ONL/POX+Wiki#POXWiki-Example-WebFlowStatistics
>>>>>
>>>>> That example filters them to only show ones on port 80, but obviously
>>>>> you don't have to do that.  There's also a further example in the third
>>>>> party section.  And POXDesk does this and displays them.
>>>>>
>>>>> If you want to do it from the commandline, look into ovs-ofctl.
>>>>> (Something like ovs-ofctl show <switch-name>.)
>>>>>
>>>>> > I stop the POX controller and I still have pings,which means that
>>>>> the flows are somewhere saved. I need to check this flows and furthermore
>>>>> to modify them.
>>>>>
>>>>> Sure.  By default, nothing in POX uninstalls them when it shuts down
>>>>> (though you could make this happen).  If I recall correctly, all the ones
>>>>> from l2_learning have timeouts, so they'll expire eventually, but they'll
>>>>> stick around until then.
>>>>>
>>>>> As mentioned above, look into ovs-ofctl.  And also ovs-dpctl.  Or
>>>>> write a POX component to modify them how you want!
>>>>>
>>>>> -- Murphy
>>>>>
>>>>> > 2013/4/16 Kouvakas Alexandros <questalex at gmail.com>
>>>>> > Hi,
>>>>> > it's a bit irrelevant with pox mailing list but do you know how can
>>>>> I create an overlay network with one node running OVS and some hosts that
>>>>> are connected to the OVS through a subnet (let's say 192.168.3.1/24)
>>>>> without running OVS on them. I mean, can I substitute the tunnel from the
>>>>> host to the OVS with something else?
>>>>> >
>>>>> >
>>>>> > 2013/4/12 Murphy McCauley <murphy.mccauley at gmail.com>
>>>>> > On Apr 12, 2013, at 2:30 AM, Kouvakas Alexandros wrote:
>>>>> >
>>>>> >> Note that only the SENDER (the OF switch) has the controller. By
>>>>> this I mean that I run "ovs-vsctl set-controller" only on the SENDER node.
>>>>> >
>>>>> > So each machine is running OVS, but only one of the OVS instances is
>>>>> connecting to a controller?  In this case, you may be able to get them to
>>>>> act as learning switches, but you can't program them from the controller,
>>>>> which is going to prevent you from doing interesting path selection using
>>>>> OpenFlow.  If that's what you want to do, connect them to the controller
>>>>> either via the controller's external IP (131.188.44.100), or by setting up
>>>>> in-band control and having the control traffic go through your tunnels.
>>>>> >
>>>>> > -- Murphy
>>>>> >
>>>>> >
>>>>> >
>>>>> > --
>>>>> > Kouvakas Alexandros
>>>>> >
>>>>> >
>>>>> >
>>>>> > --
>>>>> > Kouvakas Alexandros
>>>>> >
>>>>> >
>>>>> >
>>>>> > --
>>>>> > Kouvakas Alexandros
>>>>>
>>>>> -------------- next part --------------
>>>>> An HTML attachment was scrubbed...
>>>>> URL: <
>>>>> http://lists.noxrepo.org/pipermail/pox-dev-noxrepo.org/attachments/20130429/88fe02c0/attachment-0001.htm
>>>>> >
>>>>>
>>>>> ------------------------------
>>>>>
>>>>> _______________________________________________
>>>>> pox-dev mailing list
>>>>> pox-dev at lists.noxrepo.org
>>>>> http://lists.noxrepo.org/listinfo.cgi/pox-dev-noxrepo.org
>>>>>
>>>>>
>>>>> End of pox-dev Digest, Vol 13, Issue 46
>>>>> ***************************************
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> *Regards
>>>>
>>>> Sayed Qaiser Ali Shah
>>>> MSIT-12
>>>> NUST (SEECS)*
>>>>
>>>
>>>
>>>
>>> --
>>> Kouvakas Alexandros
>>>
>>
>>
>>
>> --
>> *Regards
>>
>> Sayed Qaiser Ali Shah
>> MSIT-12
>> NUST (SEECS)*
>>
>
>
>
> --
> Kouvakas Alexandros
>

-- 
Shouren Yang 杨守仁
Kimi

School of Information and Communication Engineering
Beijing University of Posts and Telecommunications
Beijing 100876, PR China

北京邮电大学 信息与通信工程学院

Mobile Phone:
(86) 1861-078-2697 Beijing
(86) 1506-781-8982 WenZhou

Gmail: yangshouren at gmail.com
Hotmail: kimi_ysr at hotmail.com; kimi_ysr at mscampus.cn
Yahoo mail: kimi_ysr at yahoo.com

Personal Website: kimi4ysr.me & ikimi.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.noxrepo.org/pipermail/pox-dev-noxrepo.org/attachments/20130502/bed09714/attachment-0002.htm>