[Freedombox-discuss] Freedombox Mesh Network Simulator

The Doctor drwho at virtadpt.net
Fri Jun 22 18:55:22 UTC 2012

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On 06/20/2012 10:12 AM, Dave Taht wrote:
> There are plenty of mesh protocols available - 802.11s, batman,
> olsr, and my own fav babel. 802.11s operates at layer 2, is limited
> to 32

There are over 70 mesh routing protocols; not all of them have been
implemented (a lot are just whitepapers) but maybe a dozen have.

> nodes, and has other issues, so I tend to ignore it. batman-adv is 
> also layer too but much more flexible and interesting.

It's also a little wiggy in the field.  Granted, this was in early 2011.

> But as for babel, I like it because it is a pure layer 3 protocol,
> it handles ipv6 and ipv4, and has a pluggable metric.

It's also the most resilient we've tested in the field, as well as
easy to troubleshoot.  That's why Byzantium went with it.

> possible demo... build and install babeld and ahcp on all nodes

It's also possible to use APIPA addressing on nodes and have it work.

> ifconfig wlan0 down iwconfig wlan0 mode ad-hoc channel 1 essid
> babel # channel and essid are arbitrary. Some devices won't let you
> do that in one pass

The Atheros chipsets we've been testing on don't.  It's fairly easy to
make the configuration utility robust enough to work around that.

> Now, it's easier to just setup an ahcp server to hand out
> addresses, and use ahcp for setup, but that's too long to go into
> the margins here.

If you're planning the construction of a mesh, ahcpd works well.  If
you're doing it more organically I don't recommend it.

- -- 
The Doctor [412/724/301/703] [ZS]

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