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From: Sven Eckelmann <sven@narfation.org>
Subject: Re: Running multiple batman-adv namespaces on the same broadcast domain
Date: Wed, 09 Sep 2020 11:05:11 +0200
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To: Alessandro Bolletta <abolletta@netter.io>
Cc: b.a.t.m.a.n@lists.open-mesh.org

 
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On Wednesday, 9 September 2020 10:50:24 CEST Alessandro Bolletta wrote:
[...]
> Great, this is exactly what I'm looking for! I'm running this for some
> experimental purposes. Are you running VXLANs in multicast modes?

I am using it between datacenters with handcrafted forwarding rules. And I am 
using gluon which uses link local "multicast" mode [1]. 

[...]
> > I don't like the word "namespaces" here. Because this reverse to a completely
> > different concept in the linux kernel.
> >
> 
> Yeah, I'm sorry but I didn't know how to call them. "Mesh clouds" is a
> more exact term to call our batX?

I would call them batadv interfaces. And the thing behind it - maybe mesh 
cloud.

> > And I don't know what you will end using - so I cannot say if this will work
> > or is tested.
> >
> 
> I will use them in a scenario where a have 3 hosts connected by an
> ethernet card each and a switch. Then, I have to connect at layer 2
> these hosts to batman, but I need to separate their traffic through
> different batman-adv "mesh clouds" (in my case I can't use VLANs, QinQ
> or stuff like that to do so)

I've already used both VLAN and VXLAN (and other things) for stuff like this. 
But there can always be problems with your kernel/driver/batman-adv/... 
version or even the hardware. And I can guarantee that all of them will 
create some kind of cost (overhead, performance, ...).

Kind regards,
	Sven

[1] https://github.com/freifunk-gluon/gluon/blob/dd76e0898d70a123d8e7f178384fec84890e5251/package/gluon-core/files/lib/netifd/proto/gluon_wired.sh#L39
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