[Olsr-users] OLSR mesh with loop potential... having problems.

Vigneswaran R (spam-protected)
Fri Oct 5 07:14:07 CEST 2012


Dear all,

Recently we also noticed loops in the routes established by OLSRv1, on a 
partial mesh topology (with ~20 machines). We are using olsr 0.6.3 with 
default configuration file and only Interface line has updated. Not 
using any plugins. As of now wired connections and at the deployment 
will be using wireless radios.

Due to the loop, the packets sent through one Interface and received on 
another. ssh, ping worked fine regardless of that. However, we realized 
the loop when 'nmap' erroneously reported a node as down.

One point to note here is, when we conducted the test we used 10.0.0.0/8 
subnet for all the nodes, so that we can do random reconnects to 
simulate node movements. However, Henning suggested to put different 
Interfaces of the same router into different subnets (in his reply on 
another thread). So, when we do the tests again we will see whether that 
has any impact on loops.

However, whether loop in routes are expected in general, for such 
topologies? or by doing some configuration changes can we avoid that?

Thank you.


Regards,
Vignesh



On Wednesday 27 June 2012 03:24 AM, √Črico Porto wrote:
> I think he meant a file containing the following lines
>
> IpVersion 4
> Interface "wlan0"
> {
> }
>
> √Črico V. Porto
>
>
> On Tue, Jun 26, 2012 at 4:27 PM, John Clark <(spam-protected) 
> <mailto:(spam-protected)>> wrote:
>
>
>     On Jun 26, 2012, at 12:06 PM, Markus Kittenberger wrote:
>
>>
>>     On Tue, Jun 26, 2012 at 8:29 PM, John Clark <(spam-protected)
>>     <mailto:(spam-protected)>> wrote:
>>
>>         Thanks all,
>>
>>         I updated my olsrd to the 6.3 version that's on the download
>>         page. Compiled ok, and did an install and 'install_libs',
>>         which seems to have cured my problem with loading the plugins.
>>
>>     (you could have done an install_all)
>>
>>
>>         I used the default installed olsrd.conf, and only changed the
>>         interfaces list.
>>
>>     try to use a new olsrd.conf (i.e an absolutely empty one except
>>     the protcol version ipv4 or ipv6 and the interface names)
>
>     I believe I'm using that conf, all I changed was the interface list.
>
>     I'll recheck that...
>
>>
>>     this will use default settings for everything, and might cure
>>     your actual problems,..
>>
>>         As a note, in the past, upon reflection, my 'meshes' have
>>         been either linear chains or trees, and there have bee no
>>         internal loops.
>>
>>
>>     olsrd works on such topologies, as infact such topologies are
>>     what it is meant to operate on.
>>     (it definetely does not need the networks to be a tree,..)
>
>     I've been working on this more, and will try to give more details
>     as they come to me, but at the moment, I have the problem when the
>     one link is removed, problems arise.
>
>
>     Thanks,
>     John Clark.
>
>
>     --
>     Olsr-users mailing list
>     (spam-protected) <mailto:(spam-protected)>
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>
>
>
>

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