[Battlemesh] Out of sync seqnos after reboot

Henning Rogge hrogge at googlemail.com
Fri Mar 9 07:42:04 CET 2012

The important question is how many different (sequence numbers)
messages can be in transit at the same time?

The "remember the last 31 possible sequence numbers" is just a
uint32_t used as a binary mask that is shifted every times OLSRd
accepts a new message. So even a memory of 64 sequence numbers should
be trivial and efficient to implement this way.


On Thu, Mar 8, 2012 at 22:28, Juliusz Chroboczek <jch at pps.jussieu.fr> wrote:
>> Message sequence numbers in OLSRd are originator specific, so even if
>> the order becomes mixed up, OLSRd will just ignore the outdated one
>> that comes later.
> Hmm... I need to think it over.  Babel is different from OLSR, as Babel
> routing messages can be delayed significantly (tens of seconds) and
> still be accepted, even not in seqno order, as long as the feasibility
> condition is obeyed.
> But you're right, there are probably some cases where I can detect an
> unexpected seqno and discard the feasibility state; I'll think it over.
>> Worst case might be a restart with a sequence number 31 less than the
>> last one,
> Ack.
> -- Juliusz
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