Re: [B.A.T.M.A.N.] Batman-adv and routed subnets

[Sven Eckelmann <sven@narfation.org>]

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On Friday 03 August 2012 11:08:37 Luca Pretto wrote:
> Hi folks,
> 
> I really need a bit of your help! I've already spent a week on this and I
> can't succeed! :(
> 
> I'm going to install a small mesh (12 nodes, initially) covering my city and
> linking some friends of mine. At the moment the equipment (Ubiquiti) is
> already installed, structured as AP-STA (PSK2) in one large LAN (all
> connections bridged L2) with one central dhcp/firewall serving the
> 192.168.9.0/24 subnet (now that's all inside this net only).
> 
> I would like to migrate the topology to a routed network, where the wireless
> mesh nodes have IPs allocated inside 10.9.0.0/16, and below each one of
> these nodes there will be a local LAN with reserved subnet (IP offered by
> OpenWRT through dnsmasq). I've done some experiment with OLSRd and I got a
> working system that way, but I'd REALLY LOVE to use batman-adv instead.
> Some of the networks already have internet connectivity, that will be
> shared through the mesh to whom needs it.
> 
> 10.9.11.1 <----> 192.168.11.0/24 --> 192.168.11.1 (internet gateway)
> 
> 
> 10.9.12.1 <----> 192.168.12.0/24
> 
> 
> 10.9.13.1 <----> 192.168.13.0/24 --> 192.168.13.1 (internet gateway)
> 
> 
> 10.9.14.1 <----> 192.168.14.0/24
> 
> 
> 10.9.xx.1 <----> 192.168.xx.0/24
> 
> Batman-adv will take care of the routing inside the wireless mesh (links "
> || " in the diagram). Anyway, I need that any host on the 192.168.xx.0/24
> subnets will be able to talk to each other.
> 
> How can this be done with batman-adv?

First thing: batman-adv doesn't route (as in l3 routing). batman-adv creates a 
distributed switch on l2 (so, batman-adv does path finding). Therefore, 
batman-adv doesn't care about the l3 stuff.

And the stuff you've mentioned above is l3 stuff. So out of scope for batman-
adv. Either you create static routes, use proxy arp or use another software 
that distributes the l3 routes.

Kind regards,
	Sven

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