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Henning Rogge a écrit :
Am Donnerstag 15 Oktober 2009 22:17:36 schrieb Alexandru Petrescu:Henning Rogge a écrit :Am Donnerstag 15 Oktober 2009 21:44:44 schrieb Alexandru Petrescu:How about software implementing IETF standards, geared towards advancing on the Standards Track?The RFC conform implementation of OLSR does not work well. The Freifunk/Funkfeuer community networks (which are some of the largest deployed mesh networks) all use ETX because it does not work with hopcount.Well it seems like a large effort indeed (you claim it as some of the largest deployed mesh networks) - can I ping it?
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Most freifunk/funkfeuer networks are hidden between NAT routers that connect the networks to a DSL line.I think Berlin was up to 700+ nodes some time ago, but it's a little bit shrinking because DSL is easier to get today.Leipzig is and Vienna have hundreds of nodes too (Vienna 400-500 I think).
Sorry, I don't understand you. What do you mean by e.g. Vienna has 400-500 nodes? What do these nodes do?
The DSL line I use does offer non-NAT and IPv6. How about Viena, Leipzig and Berlin?
Also, you talk NAT: is ETX exclusively related to IPv4? Does OLSRv2 work with IPv6?
What are we talking about here? I more and more feel we live in very different worlds.OLSRv2 WILL contain integrated metric support because everyone in the MANET-WG agrees that it's necessary. We are discussing about if we integrate ETX as the easiest (and layer 1/2 independant) metric as an appendix/example into the main draft or not at the moment.Well that sounds as good news for ETX and OLSR. Do you have some comment on link energy metrics?
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I think both link energy metrics and ETT have the potential to be a much better metric than ETX.
Ok, I don't know what ETT means. Expanding the abbreviation would suffice, don't send me to a paper.
OLSR.org has ETX at the moment because it's the only metric we can support on different OS/hardware platforms. We hope to move to a generic "linklayer data framework" soon, so we can start to experiment with ETT or similar metrics.Link energy metrics for WLAN are a little bit difficult because there are no exact tables how many energy each specific hardware consumes for a package.
Well there is some publicly available specification data about how much Watts are needed, and dBm levels, for WiFi. When one says Watt one says Joule and time.
There exist also measurements for WiFi emissions, and unpublished reports. Some relate to health studies.
The lack of precision could be compensated by expressing the values as a range [min, max].
I am not sure that ETX and ETT(?) have been expressed and experimented for anything else than WiFi(?)
Alex
Henning Rogge