[riot-devel] Fragmentation support in IP

Adeel Mohammad Malik adeel.mohammad.malik at ericsson.com
Thu Aug 18 18:27:21 CEST 2016

Hi Thomas,

I agree that IP fragmentation is not an equivalent for data streaming. However it still facilitates transporting data that exceeds the MTU. The use case we are looking at is encryption of IoT data that may result in a few bytes of plaintext being converted to a few kilobytes of ciphertext. Had IP supported fragmentation in RIOT it would have been possible for us to send such data.


-------- Original message --------
From: "Thomas C. Schmidt" <t.schmidt at haw-hamburg.de>
Date: 8/18/2016 18:11 (GMT+01:00)
To: devel at riot-os.org
Subject: Re: [riot-devel] Fragmentation support in IP

Hi Adeel,

GNRC in RIOT supports fragmentation, e.g. in the context of 6LowPAN.

However, you seem to be interested in sending UDP datagrams that exceed
the MTU payload size. I don't think this is common use ... and I don't
think this is clever, either. IP fragmentation is not an equivalent for
data streaming.


On 18.08.2016 18:04, Adeel Mohammad Malik wrote:
> Hi all,
> My question is about fragmentation support in IP in RIOT. Does IP in
> RIOT support fragmentation? The use case I am after is transferring a
> large blob of data (let’s say 5 kilobytes) on the UDP/IP stack in RIOT.
> Is that possible?
> I know that 6LoWPAN supports fragmentation but that is below the IP
> layer. I am interested in fragmentation at the IP layer so that
> application running over it in RIOT can send large data.
> Regards,
> Adeel


Prof. Dr. Thomas C. Schmidt
° Hamburg University of Applied Sciences                   Berliner Tor 7 °
° Dept. Informatik, Internet Technologies Group    20099 Hamburg, Germany °
° http://www.haw-hamburg.de/inet                   Fon: +49-40-42875-8452 °
° http://www.informatik.haw-hamburg.de/~schmidt    Fax: +49-40-42875-8409 °
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