[Olsr-users] Received message to big to be forwarded

Ferry Huberts (spam-protected)
Fri Apr 17 14:25:46 CEST 2015

On 17/04/15 14:22, Henning Rogge wrote:
> On Fri, Apr 17, 2015 at 2:07 PM, Jernej Kos <(spam-protected)> wrote:
>> Hello!
>> We are seeing a lot of the following messages in our logs:
>> Received message to big to be forwarded on digger1226(1296 bytes)!
>> Received message to big to be forwarded on digger1346(1328 bytes)!
>> The message sizes indicate that the OLSR messages that are to be
>> forwarded are probably larger than the MTU (the OLSR daemon has multiple
>> interfaces with different MTU sizes). Does this warning indicate some
>> problems with propagating routing information as messages are dropped
>> instead of being forwarded?
> The problem is that olsrd cannot fragment messages (which are flooded
> through the whole mesh) hop-by-hop... which means a network with
> different MTU-sizes AND large neighborhoods (which produce huge
> messages) is a problem.

Yes, you should really setup a lower MTU on all your nodes

> Henning Rogge

Ferry Huberts

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