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From: Clemens John <clemens-john@gmx.de>
Date: Fri, 08 Nov 2013 00:25:32 +0100
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Subject: Re: [B.A.T.M.A.N.] Bad link quality if routers are connected by 2
	interfaces
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Am Montag, 4. November 2013, 11:28:20 schrieben Sie:
> this is certainly not the expected behaviour. Are you building a brid=
ge loop
> by any chance? Please explain your configuration (batctl if, brctl sh=
ow,
> ...) and check if you have a high amount of broadcasts somehow.

Sorry for my late answer. I was busy during the week and didnt find the=
 time to=20
look into out setup in detail till now.

We have two wireless interfaces wlan0 and wlan0-1. We also have two eth=
ernet=20
interfaces eth0.1 and eth0.3 and one VPN interface ffolVPN.

The interfaces wlan0 and eth0.1 are the interfaces used for clients. Th=
ey are=20
bridged together with bat0:
root@RosenplatzVPN:~# brctl show
bridge name   bridge id                     STP enabled     interfaces
br-mesh          8000.a0f3c15b54a6   no                    bat0
                                                                       =
          eth0.1
                                                                       =
          wlan0

The interfaces wlan0-1 and eth0.3 are the interfaces we use for meshing=
 with=20
other routers in the same "mesh cloud". These are the interfaces both r=
outers=20
are connected by each other. The vpn interface ffolVPN is used to conne=
ct with=20
outher "mesh clouds" but the two routers in this case are not connected=
 by=20
this interface. On the interfaces wlan0-1, eth0.3 and ffolVPN runs Batm=
an=20
advanced:
root@RosenplatzVPN:~# batctl if
eth0.3: active
wlan0-1: active
ffolVPN: active

To analyze the amount of broadcast traffic I did a tcpdump on the Batma=
n=20
interfaces wlan0-1 and eth0.3. For me there seems to be a big amount of=
=20
broadcast traffic, but I don=B4t know the normal level of brodcasts so =
I can=B4t=20
compare which amount is right and which is wrong. But maybe you can so =
I=20
uploaded the files for you. You can analyze them using wireshark or som=
e other=20
tool:
* https://dev.freifunk-ol.de/tcpdumps/eth0.3.dump
* https://dev.freifunk-ol.de/tcpdumps/wlan0-1.dump

If you need more data just ask and I will try to provide it.

Kind regards
Clemens
--=20
#Clemens John <clemens-john@gmx.de>
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