[Olsr-users] Multi Hop path tracking

[Henning Rogge]

Hi,

olsrd (or any link state routing in general) only makes an educated
guess where the packet will be forwarded towards the target (with the
dijkstra algorithm) and uses this "guess" to select the next forwarder
for each destination.

You could in theory modify the dijkstra algortihm (src/spf_spf.c) to
output this data or try to parse the data structures within the tc set
(src/tc_set.h, generated by dijkstra) to get this data back, but this
is no guarantee that the packet will travel this way.

Henning Rogge

On Mon, Nov 10, 2014 at 3:35 AM, Grad Student <(spam-protected)> wrote:
> Hi Rogge,
>
> I am working on the Manet Manager App that utilized the OLSRD. I want to
> display the message route in the multi hop scenario.
>
> Here is the google groups discussion :
> https://groups.google.com/forum/#!searchin/spandev/multi/spandev/0EPzRZjY6YU/MZ-KOUvaqFwJ
>
> As the routing tables are maintained in the OLSRD, I want to know which
> files exactly I have to refer to make the necessary modifications.
> It would help me if you could point me to the relevant files.
>
> Thanks,
> TG
>
>
> On Sun, Nov 2, 2014 at 9:49 AM, Henning Rogge <(spam-protected)> wrote:
>>
>> Olsrd sets the kernel routing table, so the forwarding is just done
>> "hop by hop".
>>
>> run "ip route" to see the content of the IPv4 routing table.
>>
>> Henning Rogge
>>
>> On Fri, Oct 31, 2014 at 4:35 AM, Grad Student <(spam-protected)>
>> wrote:
>> > Hi Sir/Madam,
>> >
>> > I am Masters student. As part of my thesis work I am working on forming
>> > Mobile Adhoc network. I found one interesting android app "Manet
>> > Manager".
>> >
>> > In this app we have a feature to send messages by typing in the
>> > destination
>> > address. In case of multi hop, I want to customize the message by
>> > including
>> > the intermediate node IP's to track the path(i.e., For previous example,
>> > I
>> > want to display C received message from A through B).
>> >
>> > So I was looking around where I need to make changes in the Manet
>> > Manager
>> > source code and contacted the corresponding team. Team told me that they
>> > used OLSRD and the multi hop is handled in OLSRD.
>> >
>> > Ref : https://groups.google.com/forum/#!topic/spandev/0EPzRZjY6YU
>> >
>> > So, could anyone help me to understand how to track the path of the
>> > message
>> > in the multi hop scenario.
>> >
>> >
>> > Regards,
>> > Grad
>> >
>> > --
>> > Olsr-users mailing list
>> > (spam-protected)
>> > https://lists.olsr.org/mailman/listinfo/olsr-users
>
>