[Babel-users] Debriefing: Babel workshop at Pas Sage en Seine 2013

[Dave Taht]

On Wed, Jul 10, 2013 at 10:44 AM, Baptiste Jonglez
<baptiste.jonglez at ens-lyon.fr> wrote:
> Hi,
>
> I just realized I forgot to write about the Babel workshop at Pas Sage
> en Seine, which was more than two weeks ago.
>
> I first gave a short presentation, mostly to recall basic network
> concepts, see [1] or [2] (in French).  The slides are available
> at [3].
>
> Then, there was about one hour of workshop: people could come with
> their laptop, install babeld and ahcpd and connect to the mesh network
> deployed there.
>
> There were about 15 people with laptops, and someone had a router (but
> I don't think he managed to connect it to the mesh, unfortunately).
> Most people got it working, but some didn't.  We've had one kernel
> panic, and a few people that were on the wrong ad-hoc cell, even
> though they were using the same channel; we might have hit the cell
> limit, or simply a bug in their wireless driver.

Perhaps you ran into the BSSID problem I did, where some devices ended
up on the wrong BSSID?

>
> The base network was built using a raspberry pi (exporting a route to
> the Internet) and four TP-Link WR703N, of which two were talking with
> the raspberry pi over the existing wired network.  Everybody was using
> the same wireless channel.
>
> Shortly after the workshop, the network looked like this:
>
>   http://ze.polyno.me/babel/babelweb-pses2013-1.png
>
> Another capture showing feasible routes:
>
>   http://ze.polyno.me/babel/babelweb-pses2013-2.png
>
> There are about ten screenshots of babelweb available at [4].
>
>
> The goal was to get people to discover and play with Babel, and show
> that it works in practice; I consider this workshop a success on this
> regard, even though it was somewhat disorganized.  The workshop was
> held on Saturday, but a few people connected to the mesh network again
> on Sunday :)

I'm pretty fond of the netgear 3800 at this point. Also the
picostations and nanostations are working out well.


> On Fri, Jun 21, 2013 at 02:46:57PM +0200, Juliusz Chroboczek wrote:
>> I've just received this from our common friends:
>>
>>   http://www.pps.univ-paris-diderot.fr/~jch/cantine-20130621.jpeg
>
> Nice shot!
>
> We actually haven't used the Foneras, since we experimented with the
> TP-Link WR703N [5] on OpenWRT AA.
>
> These routers are small but excellent.  Compared to the Fonera, they
> draw almost no power: a Fonera gets very hot within tens of minutes,
> while the TP-Link were still cold after 3 days of intensive use.
>
> Since they have an USB port, it would be easy to turn them into cheap
> multi-radios routers using an USB dongle.
>
> However, they have a few drawbacks:
>
> - limited flash space.  A friend successfully bundled babeld, ahcpd
>   and tor, but it was tight.
>
> - no external connector for antenna.  Note that there are hardware
>   hacks to do this anyway [6].
>
>
> Regards,
> Baptiste
>
> [1] http://lacantine.ubicast.eu/videos/22-06-2013-124257/
> [2] http://transmission.progval.net/PSES2013/reseau_mesh.mp4
> [3] http://ze.polyno.me/babel/slides-mesh-pses-20130622.pdf
> [4] http://ze.polyno.me/babel/babelweb-pses2013-nomac.tar
> [5] http://wiki.openwrt.org/toh/tp-link/tl-wr703n
> [6] http://wiki.openwrt.org/toh/tp-link/tl-wr703n#hardware.mods
>
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-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html