Routing

6mesh project: IPv6 freifunk mesh networks

Alex Morlang and Daniel Paufler had a presentation about the current advancement of the Freifunk 6mesh project for IPv6 routing in wireless mesh networks at a meeting of Freifunk core technologists in Berlin. The presentation is currently only partly available in English, but the German version offers good insights still for people working on wireless mesh networks anywhere. 

Links:

* pdf version at freifunk Berlin download site: http://download.berlin.freifunk.net/pdf/vortrag/6mesh/freifunk-ipv6-mesh-siit-praesentation.pdf
* Alexander Morlang http://blogs.k-ita.de/~alx/
* Daniel Paufler http://blog.leo34.net

6mesh Vortrag online

Der Vortrag von Alex und Daniel aus der cbase ist nun online. Es ging um ein 6mesh (IPv6 only mesh) mit IPv4 Transport mit Hilfe von SIIT. Ein Video wird folgen.

OLSR-NG Lightning Talk at the 24c3 by Aaron Kaplan

24c3, Chaos Communication Congress: Aaron Kaplan from the OLSR developing team and member of the Austrian funkfeuer community had a short lightning talk on the recent improvements of the OLSR protocol, which they now call OLSR-NG.

The whole lightning talk session can be downloaded via the torrent network (torrents below). 

Wireless Kernel Tweaking or how B.A.T.M.A.N. learned to fly - Presentation at the 24c3 by Marek Lindner and Simon Wunderlich

Marek Lindner and Simon Wunderlich from the Berlin freifunk community gave a talk on Wireless Kernel Tweaking and the B.A.T.M.A.N. routing protocol at the 24c3 Chaos Communication Congress. The video is now available on the torrent network.

Kernel hacking definitely is the queen of coding but in order to bring mesh routing that one vital step further we had to conquer this, for us, unchartered territory. Working in the kernel itself is a tough and difficult task to manage, but the results and effectivity to be gained justify the long and hard road to success. We took on the mission to go down that road and the result is B.A.T.M.A.N. advanced which is a kernel land implementation of the B.A.T.M.A.N. mesh routing protocol specifically designed to manage Wireless MANs.

During the last years the number of deployed mesh networks has increased dramatically and their constant growth drove us around the edge of what we thought was possible. To cope with this rapid development we had to leave the slow and limited track of tweaking existing approaches and take an evolutionary step forward by porting the B.A.T.M.A.N. protocol into the kernel land and going down to layer 2. Using B.A.T.M.A.N. advanced as a showcase we will, in our lecture, deliver a detailed review on how one can go about developing linux kernel modules, give insights in what difficulties to expect and provide practical tips on how to go about this challenge without experiencing a damaging kernel freeze in due process.

We will describe what problems we faced migrating down to layer 2 and how we went about solving them for example how we moved away from the kernel routing and handle the actual routing and data transport in B.A.T.M.A.N. itself. Also moving to layer 2 meant to leave IPs behind and solely rely on MAC-routing enabling features like DHCP, IPX, IPv6, etc which up to now was not possible and therefore comes as a big plus. On the other hand there were little if none diagnostic tools at all for routing on that level so we had to go back one step and develop the tools we needed ourselves.

These and other things we will cover in our presentation and also give an outlook into the future of mesh-routing, which will bring it even closer to the source of wifi - the wireless stack and its drivers and thereby improving the overall performance even more.

Link: www.open-mesh.net

 

Chaosradio Express mit Elektra zu Freifunk und B.A.T.M.A.N.

Elektra gibt einige Einblicke zu B.A.T.M.A.N., dem Freifunk-Protokoll der Zukunft, im Chaosradio.

Schon in Chaosradio Express 016 hat Elektra einen tiefen Einblick in Wesen und Form des Mesh Networking geboten. Im Gespräch mit Tim Pritlove werden nun die neuesten Erkenntnisse der Entwicklung berichtet. Kern der Neuigkeiten ist der Nachfolger des OLSR-Protokolls namens B.A.T.M.A.N. Elektra erläutert, wie B.A.T.M.A.N. im Deatil funktioniert, welche Erfahrungen und Erkenntnisse seinem Design zu Grunde liegen und wie man sich das alles vorstellen muss. Ein Teil der Diskussion betrifft auch die geplante Mesh Networking Technologie im OLPC (XO) Laptop. (20.9.2007, http://chaosradio.ccc.de/cre045.html)

Links:

The Fonera Pack Story

This blog entry is mainly in english. Sorry for that, but the original recipient (a belgian guy) is very much better in english. Since beginning of 2007, a startup company called "FON" is distributing very cheap (subventioned) WLAN devices: the la-Fonera wireless LAN router. For these, I've created and published an additional software, called the Freifunk-Fonera-Pack available here: http://download.olsrexperiment.de/fonera/ . The Pack offers Freifunk meshing in parallel to the FON function. Obviously, I've missed to explain the different networking modes and hance a posting on our internal berlin mailing list reaches me with a lot of questions. Mario asked me to publish the anwers here.
Hi Steven,
yes I know. There's not enough info about the networking / mode stuff in the ff-fonera-pack readme. OK - I'll try.
Networking Model

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