Le mer. 30 oct. 2024, 12:26, Juliusz Chroboczek <[email protected]> a écrit :
> Hi Donald! > > >> It never worked well beyond a few nodes, since it requires global > >> synchronisation (of beacons? I forget) across the whole mesh. I could > be > >> wrong, but I believe tha 802.11s doesn't have that flaw. > > > I think the main problem with ad-hoc mode is that all the stations > > need to be able to see each other's transmissions. 802.11s is > > multi-hop and does not have that problem. Ad-hoc mode was just for > > something like a modest number of people with laptops sitting around a > > table or the like. > > I think Benjamin was assuming that there is a routing protocol running > over the ad-hoc mesh. In MANET terms, 802.11 in ad-hoc mode is the > underlay, and a proper layer 3 routing protocol (such as OLSR-ETX, Babel > or BMX6) is the overlay. > > However, it turns out that doesn't work very well in practice, the > underlay tends to get partitioned due to synchronisation issues. So > people have been running their underlays in infra mode, which causes a lot > of extra complexity, since you need to manually choose the gender of every > router. > > 802.11s routing doesn't scale, but people have been experimenting with > using a degenerate form of 802.11s as the underlay with Babel as the > overlay. I haven't tried it myself, but I've heard that it doesn't work > very well due to buggy firmware in off-the-shelf routers. > > If I understand the blog posting correctly, with APuP, the Freifunk guys > are trying to use infra mode, which is well supported by off-the-shelf > routers, but simplify the administration by allowing APs to mesh with each > other using the 4-address (WDS) frame format. Which is pretty cool if it > turns out to work at scale. > I am wondering if it could run on top of hwsim: https://www.kernel.org/doc/html/latest/networking/mac80211_hwsim/mac80211_hwsim.html Because to simulate a large network you need to have a simulator, or an actual large network to test it on. > -- Juliusz >
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