Mesh networking: olsrd? b.a.t.m.a.n.? OpenWRT?

[Bill Freeman]

If I'm not mistaken, IPv6 may have stuff to deal with hand-off, but it
doesn't replace mesh in that without mesh, only your wired APs have
connectivity.

On Wed, Feb 25, 2015 at 3:25 PM, Joshua Judson Rosen <rozzin at hackerposse.com
> wrote:

> On 2015-02-25 14:33, maddog at li.org wrote:
> > I have not been keeping up with what you have been doing, but if your
> target is moving, perhaps
> > what you want is Mobile IPv6 instead of "mesh", or a combination of the
> two.
>
> At a high level, I want to set up have some stationary servers, and a
> bunch of
> mobile nodes running around at a brisk pace, with a minimum of cabling and
> without having to deal with problems from RF shadows as the mobile nodes
> move
> around RF-opaque obstacles. The abundance of opportunities for RF shadows
> in the
> target environment means that can't just stick one Wi-Fi AP with a good
> antenna
> in a high place and be done with it, and wanting to avoid cabling pushes me
> toward (AFAIK) either mesh or WDS.
>
> I'm kind-of biased against IPv6 right now--partly because I don't have much
> understanding of it, and partly because so much of the equipment I'm using
> just doesn't support it (though my OpenWrt Wi-Fi routers do...).
>
> Somewhere in here I gather that I should (maybe) also be looking into
> 802.11r re: high-speed hand-offs.....
>
>
>
> > Also, Andy Stewart, the former long-time head of the WPI Linux Group,
> and now
> > the lead of the Chelmsford Linux Meetup group gave a talk on Mesh
> Networking
> > at the WPI group last month.  I was not able to attend due to travel, but
> > Andy is also into Ham Radio and Linux, so he may have been working on
> Mesh
> > for some time.  I have copied him on this email.
>
> Cool--hi, Andy.
>
> > I would love to learn more about Mesh, so if you guys were willing to
> put on
> > a presentation and/or workshop after you get things sorted out, I would
> be
> > happy to bring some RPis to it so we could experiment.
>
> Sure--why not. :)
>
>
> --
> "Don't be afraid to ask (λf.((λx.xx) (λr.f(rr))))."
>
>
> > ----- Original Message -----
> > Didn't the One Laptop Per Child project do mesh?
> >
> > On Wed, Feb 25, 2015 at 1:17 PM, Joshua Judson Rosen <
> rozzin at hackerposse.com > wrote:
> >
> >
> > On 2015-02-20 09:17, Curt Howland wrote:
> >> On Thu, Feb 19, 2015 at 5:20 PM, Patrick Flaherty < pflaherty at wsi.com
> > wrote:
> >>> If you do get it working, it would be a great talk at a meeting.
> >>
> >> Agreed.
> >>
> >> Mesh networking is interesting, but the implementations appear
> >> difficult to impossible at best.
> >
> > That... may actually not be the case anymore....
> >
> > When I posed the initial question, I was really sort-of grasping
> > for any leads; but now I've learned enough to at least identify
> > the different options, pick one, and even get one working.
> >
> > It looks like the prime contenders for mesh mechanisms are
> > (roughly ordered in accord with the evolutionary timeline):
> >
> > - layer-3 OLSR mesh via olsrd
> > - layer-3 B.A.T.M.A.N. mesh via batmand
> > - layer-2 B.A.T.M.A.N. mesh via batman-adv
> > - layer-1(!) mesh via 802.11s
> > - layer-3 B.A.T.M.A.N. mesh via bmx
> >
> >
> > The 802.11s mesh turns out to be remarkably easy to get up and running,
> > following the HOWTO provided by open80211s project:
> >
> > https://github.com/o11s/open80211s/wiki/HOWTO
> >
> > (how well it works is yet to be seen)
> >
> >
> > batman-adv appears to be more generalised than 802.11s:
> > batman-adv can be used to aggregate any collection
> > of layer-2 interfaces--including Wi-Fi (in infrastructure mode,
> > ad-hoc mode, or any other mode), wired ethernet, PPP links,
> > VPN links--where 802.11s (of course) can is usable only with
> > 802.11 links (and then only with some chipsets).
> >
> > Presumably 802.11s and batman-adv are the most transparent
> > options, since the other (layer-3) options rely on rearranging
> > the *IP* route tables....
> >
> > It's still not yet obvious to me what to do about mobile nodes
> > moving between the mesh nodes at speed--i.e., just how quickly
> > the mesh can deal with the topology changing (or what knobs are
> > available for tuning that), or if it makes sense to include
> > traditional APs in the mix so that the roaming nodes just do
> > traditional client dissociation/association cycles, or how
> > to handle roaming nodes that aren't equipped to do mesh networking
> > themselves.....
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