From: Simon Wunderlich <sw@simonwunderlich.de>
To: b.a.t.m.a.n@lists.open-mesh.org
Cc: MingAnn Ng <devil_eddie01@hotmail.com>
Subject: Re: [B.A.T.M.A.N.] Inquiry on interface alternating
Date: Fri, 10 Oct 2014 20:53:10 +0200 [thread overview]
Message-ID: <2009038.MjEnzh0HNt@prime> (raw)
In-Reply-To: <BLU182-W6143FFCB0F3DF09663246A8AA20@phx.gbl>
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Hello Ming Ann,
we had quite some changes for the interface alternation which were released
with batman-adv 2014.1.0 / kernel 3.14. Could you please try your scenario
with the latest batman-adv to make sure that we are not talking about old
implementations?
Here is a link which describes more technical details about the new
implementation:
http://www.open-mesh.org/projects/batman-adv/wiki/Multi-link-optimize
Thank you!
Simon
On Tuesday 07 October 2014 17:10:26 MingAnn Ng wrote:
> Hello,
>
> I am currently running some powerpc machines with buildroot environment. The
> Linux kernel version I am using is 3.8.13 and BATMAN-adv within the kernel
> without any modification. I am running interface alternating test with the
> topology below:
>
> A========B=========C
>
> There are two wireless links between A and B and two wireless links between
> B and C. The two wireless link is using two different channel and ESSID. TQ
> of the 4 links are vary from 250-255 at the initial state. I run udp iperf
> from A to C and observe tcpdump on node B for the two wireless interfaces
> (wlan0 and wlan1).
>
> I observed that interface alternation is not happening always. Sometime the
> route will be using wlan0 or wlan1 all the way from A to C, as we observed
> at node B, only 1 interface has traffic on tcpdump. Sometime when interface
> alternation happened, tcpdump for wlan0 and wlan1 will show traffic.
>
> I changed the topology to the below to test further:
>
> A---------------B=========C
>
> There is only 1 wireless link from A to B while there are two link from B to
> C. In this case, I observed that interface alternation will always
> happened, as I observed both wlan0 and wlan1 has traffic on tcpdump.
>
> Could you please explain to me what has caused interface alternation not
> happening in the 1st topology and why the interface alternation will always
> happen in the second topology.
>
> Thank you in advance,
> Ming Ann
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prev parent reply other threads:[~2014-10-10 18:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <BLU182-W625D2EA8376C93F5232A848AA20@phx.gbl>
[not found] ` <BLU182-W8782C810EEA0F5B35A10F08AA20@phx.gbl>
2014-10-07 9:10 ` [B.A.T.M.A.N.] Inquiry on interface alternating MingAnn Ng
2014-10-10 18:53 ` Simon Wunderlich [this message]
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