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

[Henning Rogge]

PMTUD for link local multicast?

Henning
Am 24.12.2014 15:41 schrieb "Teco Boot" <(spam-protected)>:

> DF=1 and no PMTUD makes no sense.
> Having a function that circumvent fragments is great. But set DF and
> discard PTB messages is wrong.
>
> If both sides of a link have different MTU, there could still be a problem.
>
> Teco
>
> > Op 24 dec. 2014, om 12:48 heeft Henning Rogge <(spam-protected)> het
> volgende geschreven:
> >
> > 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
> >
> > --
> > Olsr-users mailing list
> > (spam-protected)
> > https://lists.olsr.org/mailman/listinfo/olsr-users
>
>
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