Laurent Toutain’s research while affiliated with IMT Atlantique and other places

The longevity of the protocols used by Domain Name System (DNS) is a testament to its relevance in establishing an efficient mapping between identifiers. Recent attempts to integrate DNS into the REST (REpresentational State Transfer) paradigm have paved the way for its future evolution. However, this ”RESTification” made a reality by protocols such as DNS-over-HTTPS (DoH) or DoQ (DNS-over-QUIC), increases the latency and verbosity of the DNS. We propose to reduce such negative impacts of RESTIfication while maintaining the benefits it brings to the DNS. A new binary format based on the Concise Binary Object Representation (CBOR) called Efficient CBOR (e-CBOR) is introduced making the DNS message representation more compact and flexible. The tests carried out on our implementation show more than 57% reduction for DNS/DNSSEC queries. In the case of responses, we obtain a reduction of up to 16% in the size of messages encoded in the traditional format.

We are witnessing an exponential increase in IoT applications resting on global mobility of objects. Mobility requires moreover roaming to allow any device to move from one IoT network operator to another. The solutions proposed in the literature are however neither scalable nor secure. The consequences for devices' owners with large fleets of roaming objects may seriously impact the economic benefits of the involved services. We tackle these issues starting from IoTRoam a compliant open-source implementation of the LoRaWAN roaming architecture. This one based on regular DNS resolutions suffers from the limitations indicated above. We propose to modify IoTRoam by introducing a new entity called DNS Broker responsible for orchestrating in a decentralised fashion roaming between different operators using private and secure DNS resolutions. We experimentally show the feasibility of our approach. A preliminary performance evaluation of our implemented architecture shows equal performances for a more flexible, scalable and secure architecture.