OLSR-NG: Unterschied zwischen den Versionen

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(re-wording to make henning happy)
 
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<div style="background: red; border: 1px solid #999; padding: 5px; margin-bottom: 5px;">'''WARNING: This page is very outdated by now!'''<br>Please go to http://www.olsr.org for more current info. This is here for historical reasons.</div>
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<div style="background: red; border: 1px solid #999; padding: 5px; margin-bottom: 5px;">'''WARNING: This page is very outdated by now! It purely serves to document the Netidee project of ~2007'''<br>Please go to ''' http://www.olsr.org ''' for   more current and up to date info. This is here for historical reasons.</div>
  
  
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* Homepage: http://www.olsr.org/
 
* Homepage: http://www.olsr.org/
 
* NATO C3 Agency (NC3A) Radio Protocols Lab https://elayne.nc3a.nato.int/
 
* NATO C3 Agency (NC3A) Radio Protocols Lab https://elayne.nc3a.nato.int/
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* commercial INRIA HIPERCOM spin-off http://www.luceor.com/
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* commercial start-up http://www.luceor.com/
 
* commercial MIT Roofnet spin-off http://www.meraki.net/
 
* commercial MIT Roofnet spin-off http://www.meraki.net/
  

Aktuelle Version vom 12. Februar 2011, 21:26 Uhr

<google>OLSR</google>


WARNING: This page is very outdated by now! It purely serves to document the Netidee project of ~2007
Please go to http://www.olsr.org for more current and up to date info. This is here for historical reasons.


Goals

Our mission is simple. Build the most scalable and usable routing daemon routing wireless and fixed line segments. The routing daemon shall scale up to

  1. 10000 (10K) nodes and
  2. 20000 (20K) routes

running on low-cost hardware (200 Mhz RISC CPUs / 32MB of memory).

One of the main goals is to make OLSR more scalable in practice. 350px|right|Complexity for n=1000 nodes of different data structures in the Dijkstra shortest path (SPF) algorithm.

In the this picture you can see the different complexity graphs for the SPF under the assumption that every node has 10 edges . As you can see, the red line has O(n^2) complexity. This conformed to the implementation of OLSR from www.olsr.org (before the OLSR-NG project). OLSR-NG reduced the complexity to the green level. This will allow the mesh network clouds to become larger by a factor ~ 1000 (on the level of calculating the dijkstra (shortes path) algorithm so far).


For achieving that we first want to

  1. fix the existing olsrd and add new data structures and algorithms.
  2. Once olsrd is running fast we focus on protocol issues like
    1. measuring better links metrics, like including the bandwidth (ETT)
    2. link-state db synchronization issues (rather then brute force retransmission).

All protocol extensions shall be documented as an internet-draft and submitted to the IETF MANET working group http://www.ietf.org/html.charters/manet-charter.html


Next we want to improve the management tools of olsrd like the

  1. http_info plugin or
  2. txt_info plugins or
  3. building a new XMLinfo plugin

such that that large clouds consisting of thousands of nodes can be troubleshooted in an effective way.

Main OLSR-NG project blog: http://olsr.funkfeuer.at Slides from the OLSR-NG kickoff presentation: http://marvin.funkfeuer.at/~aaron/olsr-ng.pdf

Current Status

stable

  • olsrd 0.5.5 was released! Thx everybody a lot! - See changes int the Changelog

upcoming 0.5.6

buglist: Things that need to be changed before we release 0.5.6 

sven-ola: stimmt. glaub' ich auch. Da sind noch 2 Bugs drin.
[12:19pm] sven-ola: oder sogar drei. Das sind aus meiner Sicht:
[12:20pm] sven-ola: 1) das nach neustart unter http://localhost:2006/links derselbe Node mehrfach auftaucht
[12:20pm] sven-ola: 2) das etx_ff mit olsr-0.5.5 (oder etx_fpm) nur bis LQ=0.6 kommt
[12:20pm] sven-ola: 3) unter windoof: mehrfach Ifaces geht nicht (das mir eigentlich egal)
[12:22pm] sven-ola: bin mal kurz weg (olsrd neu start == nix inet)
...
fein. wobei das dringenste ist "neustart zeigt link mehrfach" - wenn das passiert muss man den nachbarn neu starten sonst gibts keine ordentlichen routen. Und wenn man gerade kein ssh zum Nachbarn hat, kann man lange warten <ggg>
  • Mac OS X: sendto() has wrong family parameter in OS X -> nothing gets send out
  • Bug in etx_ff <-> etx_fpm compatibility: if etx_ff (openBSD) does, then the topo entry still stays in (linux) etx_fpm
  • re-test everything on *all* OSes

200px|supported by IPA

The initial work of OLSR-NG was made possible by a grant from IPA.

After the grant, OLSR-NG still continues as a project. We are again looking for sponsors who believe in this work.

Sub projects

SPF refactoring

LSDB refactoring

RIB refactoring

miscellaneous improvements

UML test server

Data Structures and Algorithms

Who wants to contribute?

OLSR-NG is a open source project. Meaning everybody is invited to join in and help. We do have some bounties for the best solutions. If you want to participate, drop us an email: mailto:aaron@lo-res.org, mailto:hannes@gredler.at or mailto:bernd@firmix.at

Bounties

please take a look at the slides http://marvin.funkfeuer.at/~aaron/olsr-ng.pdf and get in contact with us directly.

Source code

  • Mercurial repo instructions 
 http://www.olsr.org/?q=mercurial/
Who is willing to work on something Contact info
Aaron Kaplan mailto:aaron@lo-res.org
Roman Steiner mailto:roman.steiner@gmx.at
Bernd Petrovitsch mailto:bernd@firmix.at
Andrej Rursev (zethix) mailto:zethix@gmail.com
Hannes Gredler mailto:hannes@gredler.at

Who is working on what?

Who What Status Comments
Bernd Petrovitsch, Thomas Lopatic, Hannes Gredler release 0.5 DONE
 ??? release 0.5 make packages for freifunk FW, DD-WRT, etc, windows (XP, Vista), ... and test them OPEN freifunk FW is done by Sven-Ola Tücke, .rpm and .deb by various people on olsr-dev@lists.olsr.org, Windows: ???
Aaron analyze IP autoconfig mechanisms and find the best one OPEN
Hannes Gredler tcpdump parses olsr packets, DONE
Hannes Gredler SPF improvements DONE
Hannes Gredler reduce malloc thrashing during SPF computation DONE
Hannes Gredler improve post-SPF handling (route table conciliation, best path selection) DONE
Bernd Petrovitsch rework the logging/tracing/error reporting WIP/stalled due to work in other areas
Bernd Petrovitsch rework the LQ-TC and LQ-HELLO input parsing, avoiding malloc/free thrashing DONE The output side can also be avoid malloc() and free(). Alas, the code is more complicated there.
Bernd Petrovitsch/Hannes Gredler/??? supersede all of the *_chgestruct() functions: All of them are called in exactly one place. So one can inline them there and use the pkg_get_*() functions to check and use the data. This also avoids more malloc/free thrashing and reduces the amount of code. WIP
Hannes Gredler spurious neighbor loss on nodes with high neighbor count OPEN/investigating
Aaron Kaplan,Bernd Petrovitsch olsr-ng test server DONE
Aaron Kaplan theory, complexity analysis. Goal: find the best complexity on the algorithmic side. DONE theory tells that fibonacci heaps are best, practise tells that an AVL tree as a minheap implementation fits the complexity of frequent re-keyings better
Zethix, Aaron Kaplan UML cluster setup WIP, currently we can start around 2000 UML instances. But the uml_switch software still drops packets between virtual interfaces. http://www.openvz.org seems also like a promising solution
Aaron Kaplan, Hannes draft. write a draft about LQ extensions OPEN
Bernd Petrovitsch Variuos Cleanup Mini- Projects DONE/WIP reworked floating point ops in src/mantissa.[ch] to minimize run-time impact, fixed dependencies, reworked ip address copying and comparison to get it type-safe,
Sebastian Sauer LinkQuality / metrics (e.g. ETX/ETT) improvements OPEN/WIP (no code yet committed) evaluate best current practice;
Sebastian Sauer FishEye improvements OPEN/investigating evaluate best current practice;
Sebastian Sauer effect of OLSR parameters on the mesh OPEN/investigating evaluate best current practice; spot and (maybe) eliminate dangers/instabilities
Sebastian Sauer selfish nodes / malicious nodes OPEN/investigating risk assessments

<mm>flash</mm>

Links

Papers, Theory

  AdHocSys is a two-year European project to provide reliable broadband services in rural and mountain regions. This objective
  will be achieved by means of the creation of a wireless ad hoc broadband network, with special enhancements to reliability
  and availability. The network consists of one or several gateways connecting to the global Internet and several intermediate
  nodes which provide multihop connections between the gateways and end users.

misc

Von „https://oldwiki.funkfeuer.at/index.php?title=OLSR-NG&oldid=11137“