The Internet Society Interplanetary Networks Special Interest Group (IPNSIG) has called for the development of “a common, interoperable, self-contained, and scalable routing framework within the Solar System Internet.”
SIG’s call was revealed in its September newsletter, which detailed a belated meeting of the agency’s Architecture and Governance Working Group that considered current approaches to routing data traffic in space and sought to produce a recommendation for an architecture. common interplanetary network.
That recommendation has now been issued and outlines four principles that the Group believes are necessary for a routing framework that can serve the solar system, namely:
- The general goal is to populate the forwarding tables or routing tables (where applicable) without human intervention and depart from the Earth-centric management scheme.
- To enable Autonomy we need a common and standardized way of the following:
- The population of a forwarding routing table and (where routes are calculated)
- Function that allows the packet protocol agent to access a forwarding table API that answers the question: “Where should I send this packet and with what CLA/address?”, similar to ARP lookup interop
- Define a set of functions common to each node
- Interregional routing should be based on a common standard
- Intra-regional routing could be heterogeneous, adopting methods that are tailored to the needs of a specific environment or mission
- Inter and intra-regional routing must be interoperable
- The architecture needs to be structured in some way (Hierarchy)
- Node IDs, addressing schemes, and segmentation concepts need to be further explored to scale to SSI
The IPNSIG has already developed a technology called “Delay Tolerant Networking” (DTN) that addresses the latency issue. DTN tries to address the fact that in space, long distances or network nodes disappearing behind a planet create latency and other conditions that don’t usually cause problems for terrestrial networks. Therefore, DTN adds some store-and-forward technology, so that packets are not dropped for lack of a node to contact.
The SIG meeting considered further networking ideas to advance DTN, assessing its ability to prioritize high-value data, efficiency, and ability to scale to 100,000 nodes.
The candidates are detailed in this summary report from the August meeting. Among the schemes considered was one called “Spray & Wait” which assumes that the nodes have no knowledge of the network, but in which the nodes calculate the optimal number of copies of data that can be in transit. When the traffic reaches a node, it is forwarded, and eventually the network figures out how many copies are bouncing around and stops routing any other than the ones that are already there. on my way to the destination node.
Spray and Wait was one of five approaches that met IPNSIG’s stated goal of scaling to 100,000 nodes, but failed other criteria.
While the SIG has called for work to begin on the routing framework, it has not yet been resolved who will do the work, select the relevant technologies, or decide on a development process. ®