[Roll] Semantics of DAO ACK

Joakim Eriksson <joakime@sics.se> Tue, 29 September 2015 19:44 UTC

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From: Joakim Eriksson <joakime@sics.se>
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Date: Tue, 29 Sep 2015 21:44:53 +0200
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: [Roll] Semantics of DAO ACK
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Hello All,

I have spend quite some time to get a more stable implementation of DAO handling
for Contiki RPL and I am currently looking into DAO aggregation. But I realised that
it is for me not 100% clear what a node that receives a DAO with several prefixes to
be registered but can only accept a sub-set of them. Should it be a DAO_NACK in
this case or is there any other way to handle that case?

If each would have been sent separately it is obvious that the receiving node can
do a NACK when the routing table is full and therefore it is possible to get fine-grained
answers. But with aggregation of DAOs this is not the case.

Any ideas?

Best regards,
— Joakim Eriksson, SICS