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From: Marek Lindner <lindner_marek@yahoo.de>
Date: Mon, 31 Dec 2012 15:11:24 +0800
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Subject: Re: [B.A.T.M.A.N.] batman-adv: Unable to add interface in LXC
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Cc: netdev@vger.kernel.org, Pau Koning <paukoning@gmail.com>

On Monday, December 31, 2012 03:34:38 Pau Koning wrote:
> I am running LXC (SID) under Debian SID and the current git version of
> batman-adv (v3.7-rc7-1325-gaf5d4f7) +batctl (v2012.4.0-30-ga395164).
> But it fails to add any of my interfaces and non-batman-adv interfaces
> can be created without problems
> 
> # ip link
> 13: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> state UP mode DEFAULT qlen 1000
>     link/ether 00:ff:aa:00:00:01 brd ff:ff:ff:ff:ff:ff
> 15: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
> mode DEFAULT
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> # batctl if add eth0
> Error - can't open file '/sys/class/net/eth0/batman_adv/mesh_iface':
> Read-only file system


Did you check your kernel log messages ? I'd expect batman-adv to print 
something there in case of an error.

Cheers,
Marek