[pox-dev] ARP request

[Muhammad Furqan Gagan]

After implementing my this ARP code in my controller I am recieving this error:

ERROR:openflow.of_01:[00-00-00-00-00-03 4] OpenFlow Error:
[00-00-00-00-00-03 4] Error: header:
[00-00-00-00-00-03 4] Error:   version: 1
[00-00-00-00-00-03 4] Error:   type:    1 (OFPT_ERROR)
[00-00-00-00-00-03 4] Error:   length:  76
[00-00-00-00-00-03 4] Error:   xid:     117
[00-00-00-00-00-03 4] Error: type: OFPET_BAD_REQUEST (1)
[00-00-00-00-00-03 4] Error: code: OFPBRC_BUFFER_EMPTY (7)
[00-00-00-00-00-03 4] Error: datalen: 64
[00-00-00-00-00-03 4] Error: 0000: 01 0e 00 58 00 00 00 75  00 00 00 00 00 03 00 00   ...X...u........
[00-00-00-00-00-03 4] Error: 0010: 00 00 00 02 00 00 00 00  00 01 ff ff 00 00 08 06   ................
[00-00-00-00-00-03 4] Error: 0020: 00 01 00 00 0a 00 00 02  0a 00 00 01 00 00 00 00   ................
[00-00-00-00-00-03 4] Error: 0030: 00 00 00 00 00 00 00 00  00 00 00 0a 00 1e 80 00   …………….

Any ideas how to overcome?

Thanks

Muhammad

On Nov 13, 2013, at 1:03 PM, Muhammad Furqan Gagan <furqan.gagan at gmail.com> wrote:

> I have implemented this code to handle ARP.. is it ok ? I am not sure about that.. need your comments please
> 
>         a= packet.find('arp')
>         if a:
>             if a.prototype == arp.PROTO_TYPE_IP:
>                 if a.hwtype == arp.HW_TYPE_ETHERNET:
>                     if a.protosrc != 0:
>                         if a.protosrc in arp_tale:
>                             if a.hwsrc == True:
>                                 Mac = EthAddr(a.hwsrc)
>                                 arp_table[a.protosrc] = Mac:
> 
>               
>             if a.opcode == arp.REQUEST:
>             # Maybe we can answer
> 
>             if a.protodst in arp_table:
>                 r = arp()
>                 r.hwtype = a.hwtype
>                 r.prototype = a.prototype
>                 r.hwlen = a.hwlen
>                 r.protolen = a.protolen
>                 r.opcode = arp.REPLY
>                 r.hwdst = a.hwsrc
>                 r.protodst = a.protosrc
>                 r.protosrc = a.protodst
>                 Mac = arp_table[a.protodst]
>                 
>                 Mac = _dpid_to_mac(dpid)
>                 r.hwsrc = Mac
>                 e = ethernet(type=packet.type, src=_dpid_to_mac(dpid),
>                 dst=a.hwsrc)
>                 e.payload = r
>                 log.info("%s answering ARP for %s" % (dpid_to_str(dpid),
>                 str(r.protosrc)))
>                 msg = of.ofp_packet_out()
>                 msg.data = e.pack()
>                 msg.actions.append(of.ofp_action_output(port =
>                                                           of.OFPP_IN_PORT))
>                 msg.in_port = inport
>                 event.connection.send(msg)
>                      
>             else:
>                 msg = of.ofp_packet_out()
>                 msg.actions.append(of.ofp_action_output(port = of.OFPP_FLOOD))
>                 msg.data = event.ofp
>                 event.connection.send(msg.pack())
> 
> Thanks
> 
> Muhammad
> 
> On Nov 13, 2013, at 12:56 PM, Murphy McCauley <murphy.mccauley at gmail.com> wrote:
> 
>> Durga is spot on, but I'll throw in another couple things you might look at:
>> forwarding.l3_learning handles ARP
>> proto.arp_helper attempts to make it easier to work with ARP
>> 
>> (Oh, and misc.arp_responder has moved to proto.arp_responder in newer versions.)
>> 
>> -- Murphy
>> 
>> On Nov 13, 2013, at 2:06 AM, durga <c.vijaya.durga at gmail.com> wrote:
>> 
>>> 
>>> hello,
>>> Seems pox supports packet type as arp, can be found here (pox / pox / lib / packet / arp.py ), as well as may be you can get some help by refering to the below example.
>>>  pox / pox / misc / arp_responder.py 
>>> 
>>> Cheers!
>>> Durga
>>> 
>>> 
>>> 
>>> On Wed, Nov 13, 2013 at 8:35 PM, Muhammad Furqan Gagan <furqan.gagan at gmail.com> wrote:
>>> Hello,
>>> 
>>> Any one know how to handle ARP request in controller?
>>> 
>>> Thanks
>>> 
>>> Muhammad
>>> 
>> 
> 

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