[pox-dev] Action change dstIP

Wed Jul 24 02:21:48 PDT 2013

Sorry...I should give you more details.
Yes there are 3 switches but the only involved is 00-00-00-00-00-09 and
both hosts are connected to this one.
 This is my problem. I don't understand why there isn't the flow_mod who
has to rewrite the ip if it is in the same actions list in which there is
that who is "changing" ethernet address ....

2013/7/24 Murphy McCauley <murphy.mccauley at gmail.com>

> I don't know your topology or who is sending what, and I don't know when
> anything is happening.  It might be helpful to simplify things.  There seem
> to be three switches involved here (three dumps of OpenFlow traffic)... can
> this be tested with a single switch?
>
> Offhand, it LOOKS like the only relevant switch is DPID 00-00-00-00-00-09
> (in the ..56.pcap file).  Are h1 and h2 both connected to this?
>
> Which flow_mod are you expecting to be doing the rewriting?  The only
> flows added on this switch (frames 44 and 46) don't rewrite IPs -- only
> ethernet addresses (which they seem to rewrite to the same value they
> already head).  I don't think any of the flow_mods on the other switches
> even rewrite ICMP packets (only UDP).
>
> -- Murphy
>
> On Jul 24, 2013, at 12:25 AM, Silvia Fichera wrote:
>
> I'm attaching .pcap files.
>
> h1 10.7.228.127 ping h2 10.169.130.142
>
> after some seconds their ip changes
>
> h1 10.93.159.214 h2 10.153.255.138
>
> and I haven't stop ping because I want h2 continues to receive packets
> despite its IP is changed.
> So I've insert the action of changing previous dst IP with the new one.
> But you can see in the capture that this doesn't happen...
>
>
> 2013/7/24 Murphy McCauley <murphy.mccauley at gmail.com>
>
>> I'm confused.
>>
>> On the control channel if you watch the OpenFlow traffic, I would expect
>> to see flow_mods which include the rewrite action.  But not any actually
>> rewritten packets, because you're not rewriting the control traffic.
>>
>> On other interfaces (e.g., to the hosts), I would expect to see some
>> packets (not OpenFlow) with rewritten addresses.
>>
>> -- Murphy
>>
>> On Jul 23, 2013, at 5:40 AM, Silvia Fichera wrote:
>>
>> Thank you.
>> All OF packets are in the loopback inteface.
>> I watched this capture and there's no changeing of destination IP.
>> I added the action before append of.ofp_action_dl_addr.dst mac (that is
>> the same of old destination, because the host has change its IP but not the
>> mac)  and of.ofp_action_output(port=prt) (also this is the same). Maybe I
>> put it in a wrong position
>>
>>
>> 2013/7/23 Murphy McCauley <murphy.mccauley at gmail.com>
>>
>>> I assumed you were trying to look at the packet for which you'd done the
>>> rewriting (which I would not expect to be OpenFlow) to see if it had been
>>> rewritten correctly.
>>>
>>> If you want to look at the flow_mod to make sure it looks correct, the
>>> correct interface to look at depends on your configuration.  If you're
>>> using Mininet in a VM and POX in your host environment, it's the virtual
>>> adapter between the VM and host (the default sets this up as eth0).  But
>>> perhaps an easier way is to run the openflow.debug POX component, which
>>> will generate a .pcap trace file in the POX directory that you can load
>>> into Wireshark.
>>>
>>> -- Murphy
>>>
>>> On Jul 23, 2013, at 3:20 AM, Silvia Fichera wrote:
>>>
>>> Same situation if I whatch, e.g. h1-eth0, and it is pinging. I have only
>>> UDP, ARP and ICMP. No OF packet.
>>>
>>>
>>> 2013/7/23 Murphy McCauley <murphy.mccauley at gmail.com>
>>>
>>>> What happens if you watch the host's interface instead?  If you don't
>>>> see the packets there, it seems like you may have a problem elsewhere...
>>>>
>>>> -- Murphy
>>>>
>>>> On Jul 23, 2013, at 3:08 AM, Silvia Fichera wrote:
>>>>
>>>> I've filtered of packets and I can see it ONLY if I choose "any"
>>>> interface.
>>>> If I'm on a switch (the right switch) interface, I see nothing with
>>>> that filter. Without filter I can see only ARP, ICMP and UDP packets.
>>>>
>>>>
>>>> 2013/7/23 Murphy McCauley <murphy.mccauley at gmail.com>
>>>>
>>>>> A couple tips:
>>>>>
>>>>> Make you sure you're running wireshark on the right interface (e.g.,
>>>>> the outgoing interface of the switch or the interface of the destination
>>>>> host).
>>>>>
>>>>> Make sure you are doing the output action AFTER you do the rewrite
>>>>> action.
>>>>>
>>>>> -- Murphy
>>>>>
>>>>> On Jul 23, 2013, at 2:48 AM, Silvia Fichera wrote:
>>>>>
>>>>>
>>>>> Hi all,
>>>>> I added in l3_learning the action of changeing dst IP with
>>>>>
>>>>> action.append.(of.ofp_action_nw_addr.set_dst(IPAddr(new_dstaddr)))
>>>>>
>>>>> where new_dstaddr is the new destination IP.
>>>>> How can I check if the action of changing dstip had success?
>>>>> In wireshark I've checked srcip and dstip of the ipv4 packet but the
>>>>> destination is unchanged...
>>>>>
>>>>> Thanks
>>>>> --
>>>>> Silvia Fichera
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Silvia Fichera
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Silvia Fichera
>>>
>>>
>>>
>>
>>
>> --
>> Silvia Fichera
>>
>>
>>
>
>
> --
> Silvia Fichera
> <2013-07-24-0708AM_127_0_0_1_38654.pcap>
> <2013-07-24-0708AM_127_0_0_1_38655.pcap>
> <2013-07-24-0708AM_127_0_0_1_38656.pcap><h1-eth0>
>
>
>

-- 
Silvia Fichera
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