[Olsr-users] OLSR routing issue with highly connected node

[Henning Rogge]

On Wed, Dec 24, 2014 at 10:46 AM, Jernej Kos <(spam-protected)> wrote:
> Hello!
>
> The absence of HELLOs led me to investigate the MTUs more closely and it
> now seems that there is actually some issue with MTU discovery on the
> broker side -- nodes configure the correct MTU towards the broker, but
> the broker sometimes fails to configure correct MTU towards the nodes.
>
> So this may be the cause of the problem and not OLSR as HELLOs from the
> server might then be dropped as being too large when received at the
> node. Will report back when I determine what is causing this.

Yes, I could see this becoming a problem.

olsrd uses the advertised MTU to make the packets as small as
necessary and mark them as "do not fragment"... if the MTU is wrong,
the packets might be dropped.

Henning Rogge