Hi Carlos, You can use a whole bunch of heuristics to decide where a host is connected to. For example, packet-in's can be useful. Or you can try to ping the host. But none of this is guaranteed to work. This is a hard problem in itself.
For SNMP, I suggest you get SNMP to work with Floodlight first. I used NOX (classic) which I augmented to work with SNMP. If Floodlight does not have such support now, someone would need to do that. It might as well be you if you have the incentive to do so. Regards KK On 19 November 2012 17:31, Carlos Patricio Amigo Haering <cam...@udec.cl>wrote: > Dear KK, > > Thank for your help. > > When a host connects and disconnects is an indicator to know where is it, > but not very accurate, as you said. So, Did you use another indicator to > know this? > > About your suggestion: You're right, my first step is learn about SNMP > because i've never worked before with it. Did you use a traphandler for > linux or your write your own? I think this is my main problem (snmp > send/reception) now because i'm using Floodlight as controller that doesn't > support SNMP but it seems like is not a big problem add flows based on a > information that the controller receives. > > > Regards. > > El 2012-11-14 11:14, kk yap escribió: > > Hi Carlos, >> >> The SNMP notification of when a host connects and disconnects is >> indeed an indicator. But it is not very accurate. You have to assume >> that the host disconnect nicely here, which does not always happen. >> >> My suggestion is to get SNMP working with some controller first. It >> is much easier to make progress in that and then start to use >> Openwrt's SNMP with the controller. I cannot bring myself to suggest >> NOX classic to you at this point, given the level of support. So, >> please choose some other controller to work with. >> >> Regards >> KK >> >> On 13 November 2012 17:55, Carlos Patricio Amigo Haering >> <cam...@udec.cl> wrote: >> >>> Thanks for the reply KK. >>> >>> Sorry, Now i don't know if i'm understanding well: OpenRoads uses SNMP >>> traps >>> to notify events from APs like for example if a host has connected or >>> disconnected, right? With this you do know where it's the wireless host, >>> don't you? What assumptions am I missing? >>> >>> Actually until i've seen SNMP works similar in OpenWRT: I have the >>> etc/default/snmpd, snmpd.conf, etc. The most doubts that i have are in >>> the >>> controller's side. Openroads uses nox's module to recieve and process the >>> traps using some net-snmp manager for linux or something like that? How >>> works? >>> >>> Sorry about the bunch of questions. >>> >>> Thanks in advance. >>> >>> >>> El 2012-11-13 18:50, kk yap escribió: >>> >>> Hi Carlos, >>>> >>>> I am actually a little curious on how you want to use SNMP to locate >>>> the host in the network. Trying to know where a wireless host is in a >>>> network is generally hard without making some assumptions. >>>> >>>> Also, I am not sure how SNMP works in Openwrt. We worked with native >>>> Linux based APs. >>>> >>>> Finally, if I may, I suggest you try another controller other than NOX >>>> classic. Hopefully, the other controllers have SNMP support at this >>>> point. >>>> >>>> Regards >>>> KK >>>> >>>> PS>> It is wise to use the mailing list for such matters. >>>> >>>> On 13 November 2012 10:08, Carlos Patricio Amigo Haering >>>> <cam...@udec.cl> wrote: >>>> >>>>> >>>>> Thank you Nikhil. Hopefully KK has enough time to help me. >>>>> >>>>> El 2012-11-10 07:33, Nikhil Handigol escribió: >>>>> >>>>> Hi Carlos, >>>>>> >>>>>> I'm cc'ing KK, who knows better about the current status of the >>>>>> >>>>> >>>>> >>>>> >>>>> >>>>> OpenRoads code. >>>>>> >>>>>> -// >>>>>> >>>>>> >>>>>> On Fri, Nov 9, 2012 at 6:58 AM, Carlos Patricio Amigo Haering >>>>>> <cam...@udec.cl [2]> wrote: >>>>>> >>>>>> Hello Nikhil, >>>>>>> >>>>>>> At my University we are working on Openflow and me specifically >>>>>>> working on seamless handover using Pantou (Openflow over OpenWRT). >>>>>>> My APs are Cisco Linksys WRT54GL and as controller i'm using >>>>>>> Floodlight. I've been reading about OpenRoads and i want to use the >>>>>>> system snmp trap-manager to know where it's the mobile client but >>>>>>> the documentation was made using another AP and another controller >>>>>>> so i'm trying to figure out how works in details so then export >>>>>>> >>>>>> >>>>>> >>>>>> this >>>>>> >>>>>>> >>>>>>> >>>>>>> to my own setup. I think the AP's part is similar to what i have to >>>>>>> do but in the controller side i have some questions and i hope that >>>>>>> you help me: >>>>>>> >>>>>>> i) Nox manages and process the snmp traps that receives, right? >>>>>>> This is a nox's module ? In the step "Get the OpenRoads NOX source >>>>>>> code" i'm getting nox controller with this module ? or just the >>>>>>> module? Btw, in this step i have a unexpected message: >>>>>>> >>>>>>> $ git clone >>>>>>> git://gitosis.stanford.edu/**openroads.git<http://gitosis.stanford.edu/openroads.git>[1] >>>>>>> noxcore >>>>>>> >>>>>>> Cloning into noxcore... >>>>>>> fatal: The remote end hung up unexpectedly >>>>>>> >>>>>>> So i couldn't do the cd snmp-wifi/server; make >>>>>>> >>>>>>> ii) The way to manages the snmp trap is based on what? some >>>>>>> net-snmp's manager for linux? What it's the "snmp_executor"? >>>>>>> >>>>>>> I would really appreciate a help that guide my way. >>>>>>> >>>>>>> Thanks in advance. >>>>>>> >>>>>>> Regards. >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Links: >>>>>> ------ >>>>>> [1] >>>>>> http://gitosis.stanford.edu/**openroads.git<http://gitosis.stanford.edu/openroads.git> >>>>>> [2] mailto:cam...@udec.cl >>>>>> >>>>> >>>>> >>>>> >>>>> >>> >
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