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From: Sven Eckelmann <sven@narfation.org>
Subject: Re: Issue with bridging LAN and mesh network
Date: Sun, 16 Feb 2020 19:39:33 +0100
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Cc: Emilie Meyer <emiliemeyer1016@gmail.com>

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On Sunday, 16 February 2020 19:20:41 CET Emilie Meyer wrote:
[...]
> root@OpenWrt:~# ip link set eth0 master mesh-bridge
> ip: either "dev" is duplicate, or "master" is garbage
[...]
> OpenWrt 18.06.4, r7808-ef686b7292
[...]

The problem here is that the networking/libiproute/iplink.c from busybox in 
OpenWrt 18.04.x has the code for the "master" interface configuration 
disabled. You have various options:

* switch to the current release OpenWrt 19.07
* switch from busybox's iplink applet to the package ip-full
* use netifd to configure the interfaces [1]
* use brctl to configure the bridge slave interfaces

     brctl addif mesh-bridge eth0

Kind regards,
	Sven

[1] https://www.open-mesh.org/projects/batman-adv/wiki/Batman-adv-openwrt-config#Batman-adv-201300-till-20190-2
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