Generating ARPs in OpenFlow is a frequently encountered problem (a FEP?)!! And
how to do so conveniently and correctly might be something of what I call a
FABNAQ - a Frequently Asked But Never (or rarely adequately) Answered Question.
(FABNAQs are great because they generate lots of Google results which don't
actually answer the question.)
So, if you have working code to generate correct ARP replies, I think sending
it to the list would be helpful for posterity!
Also, for NOX developers - what is the preferred easy way to generate ARP
packets? If it's not simple or convenient, is there a way to make it more so?
-Bob
On Feb 16, 2011, at 12:18 PM, Niky Riga wrote:
> Hi Aaron,
>
> that might not be an issue at all, but I don't see in your code where you set
> the ethernet headers (basically the src and dst) for the arp reply.
>
> If you want, I have some code that I wrote a while back to send arp replies,
> that seemed to work as expected. I can forward it along if this is helpful.
>
> --niky
>
> On 2/16/11 2:59 PM, Aaron Rosen wrote:
>> Hello,
>>
>> I'm trying to send arp replies from my nox controller though for some
>> reason my packets don't seem to be getting sent out and I was hoping
>> someone could point out where I'm going wrong. This is the code I
>> have:
>>
>> if packet.type == ethernet.ARP_TYPE:
>> arppacket = arp.arp(packet.next.arr, packet.next.prev)
>> if arppacket.opcode == arppacket.REQUEST:
>> tmp_dst = arppacket.protodst
>> arppacket.protodst = arppacket.protosrc
>> arppacket.protosrc = tmp_dst
>> arppacket.hwdst = arppacket.hwsrc
>> arppacket.hwsrc = mac_to_int('\xd2\x85\xde\x8e\xf6\x13')
>> arppacket.opcode = arppacket.REPLY
>> packet.next = arppacket;
>> self.send_openflow(dpid, None, packet.arr,
>> openflow.OFPP_FLOOD, inport);
>> print "ARP REPLY SEND!!"
>> return CONTINUE
>>
>> When I run tcpdump on the node that is sending the requests I does not
>> see any of these packets.
>>
>> I'm trying to look at my openflow traffic with wireshark but for some
>> reason I'm not seeing any. Though at my controller I'm definitely
>> getting the packets. (I think this may because I'm using mininet? I've
>> tried all the interfaces on my machine in wireshark). Though when I
>> try this using the Openflow Tutorial provided VM i'm also not seeing
>> any 'of' packets in wireshark there? (Any idea why)?
>>
>> Thanks,
>>
>> Aaron
>>
>>
>>
>
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