[Olsr-users] 2 hop nodes cost and packet loss

[Henning Rogge]

Hmm...

it looks like some of your links are really unstable.

the routing table below says the total cost from 200 over 196 to 197
is ~3 (one in three attempts without retransmissions would get
through).

But the topology table above says (same links, just some time ago):
192.168.0.200	192.168.0.196	(0.580/0.497) 3.459
192.168.0.196	192.168.0.200	(0.497/0.748) 2.681

192.168.0.197	192.168.0.196	(1.000/0.905) 1.104
192.168.0.196	192.168.0.197	(1.000/1.000) 1.000

Which means that even the best two-hop connection is really bad (ETX
of 3.5 on a single link is bad).

I wonder how much these ETX values fluctuate...

Henning Rogge


On Wed, Mar 13, 2013 at 5:32 PM, Vamsi Gondi <(spam-protected)> wrote:
> Hi,
>
> here are the routes, i see one of the 2 hop node is not in the routing
> table, node 192.168.0.197 is routing through 192.168.0.196 node to internet
>
> OLSR Routes in Kernel
> Destination Gateway Metric ETX Interface
> 192.168.0.196 192.168.0.196 1 1.226 ath6
> 192.168.0.197 192.168.0.196 2 2.915 ath6
> 192.168.0.198 192.168.0.198 1 1.256 ath6
> 192.168.0.199 192.168.0.199 1 1.104 ath6
>
>
> On Wed, Mar 13, 2013 at 12:23 PM, Henning Rogge <(spam-protected)>
> wrote:
>>
>> Okay...
>>
>> I would suggest doing the tests with this "minimal" configuration.
>> Keeps the chance higher that we find the problem.
>>
>> Can you please run a "/route" command in the txtinfo plugin too?
>>
>> Henning Rogge
>>
>> On Wed, Mar 13, 2013 at 4:22 PM, Vamsi Gondi <(spam-protected)>
>> wrote:
>> > Hi,
>> >
>> > initially i tried with the minimal configuration with the same issues,
>> > later
>> > i modified the configuration file to improve the performance.
>> >
>> > vamsi
>> >
>> >
>> > On Wed, Mar 13, 2013 at 11:14 AM, Henning Rogge
>> > <(spam-protected)> wrote:
>> >>
>> >> On 03/13/2013 03:47 PM, Vamsi Gondi wrote:
>> >>>
>> >>>
>> >>>
>> >>> Hi,
>> >>>
>> >>> i am developing a testbed using OLSR on PCEngine Alix with Debian, i
>> >>> have 6 nodes as the part of the experiment, i initially used v0.5
>> >>> version later moved to v0.6.5.2, i have enclosed the setup topology.
>> >>>
>> >>> I have a gateway 192.168.0.210
>> >>>
>> >>> 1 Hop Nodes 192.168.0.196, 192.168.0.198, 192.168.0.199
>> >>>
>> >>> 2 Hop Nodes 192.168.0.197, 192.168.0.200
>> >>>
>> >>> i dont have any issues with the 1 Hop nodes with the current
>> >>> configuration setup, but when it comes to 2 Hop nodes the cost goes to
>> >>> infinite most of the time even though they are in range with 1 hop
>> >>> nodes.
>> >>>
>> >>> Also when they establish the link, i have lot of packet losses and
>> >>> link
>> >>> is not stable for longer duration's. (I can Ping most of the nodes
>> >>> with
>> >>> variable latency like 6ms, 24ms. 43ms, 63ms, 6ms, 20ms from one packet
>> >>> to packet). I cant access most of the websites, tested with wget,
>> >>> after
>> >>> resolving the domain it says no route to host.
>> >>
>> >>
>> >> Can you reproduce the problem with the "minimal freifunk
>> >> configuration"?
>> >>
>> >> > Interface "wlan0"
>> >> > {
>> >> > }
>> >>
>> >>
>> >> Henning Rogge
>> >>
>> >>
>> >> --
>> >> Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für
>> >> Kommunikation, Informationsverarbeitung und Ergonomie FKIE
>> >> Kommunikationssysteme (KOM)
>> >> Fraunhofer Straße 20, 53343 Wachtberg, Germany
>> >> Telefon +49 228 9435-961,   Fax +49 228 9435 685
>> >> mailto:(spam-protected) http://www.fkie.fraunhofer.de
>> >>
>> >>
>> >> --
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>> >> (spam-protected)
>> >> https://lists.olsr.org/mailman/listinfo/olsr-users
>> >
>> >
>> >
>> >
>> > --
>> > Vamsi Krishna GONDI, Ph.D,
>> >
>> > --
>> > Olsr-users mailing list
>> > (spam-protected)
>> > https://lists.olsr.org/mailman/listinfo/olsr-users
>>
>>
>>
>> --
>> We began as wanderers, and we are wanderers still. We have lingured
>> long enough on the shores of the cosmic ocean. We are ready at last to
>> set sail for the stars - Carl Sagan
>
>
>
>
> --
> Vamsi Krishna GONDI, Ph.D,



-- 
We began as wanderers, and we are wanderers still. We have lingured
long enough on the shores of the cosmic ocean. We are ready at last to
set sail for the stars - Carl Sagan