[pox-dev] Build MAC list

[Murphy McCauley]

On Nov 25, 2013, at 2:18 PM, Amer <amer7777 at hotmail.com> wrote:

> Hello,
> I tried it, it works fine.
> I tried pox.py forwarding. l2_multi openflow.discovery proto.dhcpd: default 
> 
> I received in Debug:
> misc.dhcpd [00-00-00-00-00-07 4] no packet
> proto.dhcpd [00-00-00-00-00-07 4] no packet
> 
> DHCP packet data too short to parse: data len 86

On ConnectionUp, dhcpd installs a table entry to ensure that DHCP packets get to the controller.
On LinkEvent, l2_multi clears the flow tables of all connected switches to set up new paths.

.. this is probably the source of the problem.  The latter is undoing the former.  You could try fixing it in a number of ways.  I'd probably do it by subclassing the DHCP server and adding a LinkEvent handler at a lower priority than l2_multi's.  In the handler, I'd just reinstall the DHCP table entry.

-- Murphy

> Best regards,
> Amer
> 
> Sent from my iPhone
> 
> On ٢٤‏/١١‏/٢٠١٣, at ٤:١٨ م, Murphy McCauley <murphy.mccauley at gmail.com> wrote:
> 
>> Try to isolate the problem.  What if you just run discovery and the DHCP server?  Does it work then?  Does the log (at DEBUG level) provide any hints?
>> 
>> -- Murphy
>> 
>> On Nov 24, 2013, at 3:44 AM, Amer <amer7777 at hotmail.com> wrote:
>> 
>>> Dear Murphy
>>> 
>>> I tried
>>>> pox.py log.level --DEBUG proto.dhcpd:default
>>> 
>>> It is OK
>>> But I do not know what is the problem in previous command
>>> 
>>> Best regards,
>>> Amer
>>> 
>>> On ٢٤‏/١١‏/٢٠١٣, at ١:٢٦ ص, Murphy McCauley <murphy.mccauley at gmail.com> wrote:
>>> 
>>>> Have you tried a simple test?
>>>> pox.py log.level --DEBUG proto.dhcpd:default
>>>> 
>>>> -- Murphy
>>>> 
>>>> On Nov 23, 2013, at 2:11 PM, AMER <amer7777 at hotmail.com> wrote:
>>>> 
>>>>> Hello,
>>>>>  
>>>>> I tried the following:
>>>>>  
>>>>> pox.py forwarding.l2_multi openflow.discovery proto.dhcpd --network=10.1.1.0/24 --ip=10.0.0.4 --first=10 
>>>>> in l2_multi,  from pox.lib.packet.dhcp import *
>>>>> under Switch() class I added
>>>>> core.DHCPD.addListenerByName('DHCPLease', _H_hate_)
>>>>> def _H_hate_ (self, event):
>>>>>     macmap[event.connection.dpid] = event.host_mac
>>>>>     print "DHCP"
>>>>>  
>>>>> in mininet CLI
>>>>> >h4 dhclient -v
>>>>> Internet Systems Consortium DHCP Client 4.1-ESV-R4
>>>>> Copyright 2004-2011 Internet Systems Consortium.
>>>>> All rights reserved.
>>>>> For info, please visit https://www.isc.org/software/dhcp/
>>>>> Listening on LPF/h4-eth0/f2:f9:b3:96:ba:0b
>>>>> Sending on   LPF/h4-eth0/f2:f9:b3:96:ba:0b
>>>>> Sending on   Socket/fallback
>>>>> DHCPDISCOVER on h4-eth0 to 255.255.255.255 port 67 interval 3
>>>>> DHCPDISCOVER on h4-eth0 to 255.255.255.255 port 67 interval 5
>>>>> DHCPDISCOVER on h4-eth0 to 255.255.255.255 port 67 interval 5
>>>>> DHCPDISCOVER on h4-eth0 to 255.255.255.255 port 67 interval 13
>>>>> 
>>>>> What is the problem
>>>>>  
>>>>> Best regards,
>>>>>  
>>>>>  
>>>>> 
>>>>> 
>>>>> Eng Amer Alghadhban
>>>>> COE
>>>>> SANS-GCFW
>>>>> CEH, SCNP, CCNA
>>>>> 
>>>>>  
>>>>> From: amer7777 at hotmail.com
>>>>> Date: Sat, 23 Nov 2013 22:03:06 +0300
>>>>> To: c.vijaya.durga at gmail.com
>>>>> CC: pox-dev at lists.noxrepo.org
>>>>> Subject: Re: [pox-dev] Build MAC list
>>>>> 
>>>>> Thank you
>>>>> This means I should ping each host in the network to get the packets.
>>>>> I want something automatic like openflow discovery to discover the clients. I have another question:
>>>>> What does DHCP request message has (i.e., attributes)? In POX not in general.
>>>>> 
>>>>> Best regards,
>>>>> Amer
>>>>> 
>>>>> Sent from my iPhone
>>>>> 
>>>>> On ٢٣‏/١١‏/٢٠١٣, at ٤:٣٤ م, durga <c.vijaya.durga at gmail.com> wrote:
>>>>> 
>>>>> Hi Amer,
>>>>> 
>>>>> I am not too sure if I understand your question,but to my current learning, all the above fields can be collected as in_port.src (mac ID), event.dpid (switch connection) and event.port( inport).
>>>>> 
>>>>> Cheers!
>>>>> Durga
>>>>> 
>>>>> 
>>>>> 
>>>>> On Sat, Nov 23, 2013 at 10:47 PM, Amer <amer7777 at hotmail.com> wrote:
>>>>> Hello,
>>>>> 
>>>>> I want to collect MAC addresses of each host in the network and switch they connect to and port number.
>>>>> I think about DHCP and openflow discovery, but I do not know how to combine them.
>>>>> 
>>>>> 
>>>>> Best regards,
>>>>> Amer
>>>> 
>>