[avahi] Packets larger than MTU

Thomas Delaet thomas at delaet.org
Wed Oct 7 07:04:31 PDT 2009

In the Sugarlabs project (sugar-presence-service), public keys are
published by with multiple key/value pairs.

For example
<key-part-1, first 100 bytes>
<key-part-2, second 100 bytes>

Kind Regards

On Wed, Oct 7, 2009 at 3:19 PM, Jakob Blomer <jakob.blomer at cern.ch> wrote:
> Hi,
> I am trying to (mis)use the txt record to publish a global configuration
> file together with a service, basically key value pairs that usually
> reside in /etc/...
> For publishing, I use (a slightly modified) avahi-publish utility and
> add strings linewise to the txt record.  It seems that if the packet
> size exceeds the MTU, the txt record is cut off.  I played around a
> little and hard coded the MTU to a high value.
> Though this seems to work, even with unmodified Avahi instances on
> receiver side, I'm wondering if there is a more elegant way of
> publishing big records.  In particular, being able to publish arbitrary
> large records would be helpful.
> Cheers,
> Jakob
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