[Nepal] inter school mesh

Aaron Kaplan aaron at lo-res.org
Sat Apr 5 18:35:26 EDT 2008

On Apr 4, 2008, at 8:06 AM, Dev Mohanty wrote:
> Hi Aaron!
> We'd love to have inter-connectivity over mesh to both schools, and we
> definitely want the network to be scalable so that we are able to
> inter-connect the new schools as when they get setup.

jup, I think we can achieve something here.

> Though guess there's plenty of testing we want to do on-site at both
> schools to get a better understanding of the mesh behavior with heavy
> traffic. As you mention, we wouldn't get too far having them  
> networked on
> the 802.11s as there'd be way too much traffic clogging up the  
> network. We
I want to add that the 802.11s implementation is really good IMHO But  
it was simply intended for local use. So, let's try to climb the next  
mountain now and cross connect schools ;-)

> would need to have different chunks of network meshing up with another
> over olsr. Though, it all sounds good theoretically.. wonder how  
> jabber
> would play up.

Well, jabber runs over regular TCP/IP right? So I guess it is used a  
lot for the presence etc. services, no?
> Would like discuss what other alternatives we have besides jabber.  
> Guess
> for the time being we'd have an asterisk server setup on one of the  
> boxes

> so that the teachers can call in and discuss things between them.

asterisk is done over here. We run the whole funkfeuer.at network  
with one asterisk server, outgoing phone calls are possible via call- 
by-call uplinks and of course internal calls are for free. Most of  
the outgoing calls are dirt cheap.

> How about discussing it over skype, sometime in the around coming  
> mon-tue
> as am out of town for the weekend.

Hm, my goal would be to get you started as quickly as possible. Do  
you know the linksys WRT54GL setups with external wifi antennas?
We use those a lot. Well, I propose that we talk really early in the  
morning my time zone (CET) or at evening (> 18:00) because I will be  
loaded with stuff at work.
Would that be ok for you? My skype name is "ipo2323"


> Regards,
> Dev
>> Hey Aaron!
>> I would love to discuss this w/ you more but I am totally swamped  
>> over
>> the next several weeks on QA for the XO's and bundled activities. Ah,
>> doing QA I am now one with the IT proletariat.
>> Your idea sounds great and Dev Mohanty is the guy to pursue it. He  
>> is in
>> charge of all things networking for us. I will leave it to him to
>> contact you.
>> We very much want to interconnect the two schools so they can support
>> each other. One of the teachers at Bishwamitra, Manoj Ghimire, has  
>> quite
>> strong technical skills. We want to set up an Asterisk server so they
>> can easily call each other. Dev is the lead on this.
>> On Thu, 2008-04-03 at 15:13 +0200, Aaron Kaplan wrote:
>>> Hi Bryan !
>>> (brief preview: we managed to port sugar to the classmate - a story
>>> will appear soon on olpcnews the next few days - stay tuned ;-) )
>>> I would like to help you/ support you with running an inter-school
>>> mesh (layer 3, olsr) between the different sites.
>>> This way you can reach high redundancy in the network.
>>> We were talking about that in Boston but somehow everybody is
>>> constantly busy with things.
>>> I would envision that there are basically two meshes: one local OLPC
>>> layer 2 802.11s mesh and a layer 3 inter school mesh.
>>> This way you won't get into scalability problems. The 802.11s mesh
>>> won't scale up to many schools in one cloud. That would be to much
>>> network traffic and nothing would work anymore. But by having two
>>> networks you can break down the problem into reasonable chunks. We
>>> would have to find a way how to relay traffic from one cloud to the
>>> other in case that is necessary. Maybe via jabber servers or so.
>>> If you are interested in that - drop me a mail or let's have a brief
>>> skype call.
>>> a.
>>> --
>>> L. Aaron Kaplan
>>> nic.at   //   cert.at
>>> kaplan at cert.at
>>> +43 1 505 6416 / 46
>> --
>> Bryan W. Berry
>> Systems Engineer
>> OLE Nepal, http://www.olenepal.org

L. Aaron Kaplan
nic.at   //   cert.at
kaplan at cert.at
+43 1 505 6416 / 46

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