DTNs and GENI Measurement Will Leland wel@bbn.com First GENI Measurement Workshop Madison, WI 2009-06-26

Implications for GENI Measurement Looking at GENI measurement requirements and system with some specific research areas in mind Disruption Tolerant Networking (DTN) Content-Based Access (CBA) Wider network science context Focus on What support do these areas need from the GENI measurement infrastructure? What benefits might they bring to realizing that infrastructure?

DTN Key Concepts Exchange “bundles”, which have explicit lifetimes Network not necessarily ever connected No need for end-to-end connected path Network opportunistically routes a bundle “toward” its destinations Network holds a bundle till its lifetime expires Bundles have metadata Metadata may be more widely distributed than the data Data and metadata may have different access control Destinations can be described, rather than addressed Late binding of destinations Deliver to destinations that match description at any time during the bundle’s lifetime

GENI as a Disrupted Network GENI can be a powerful tool for studying networks with challenged components GENI slices can contain challenged components (e.g., sensors, MANET nodes, etc) Location, time synch, real-time access may be unavailable Federation implies subnets can join, leave, rejoin The measurement infrastructure itself may be disconnected A (logically) central repository for measurements may be infeasible A researcher’s access may be intermittent Federated components may have constraints on what can be measured or what measurements can be shared Technology, policy, contingency, …

Implications for Measurement Architecture Preserve characterizations of limitations in time & location information Allow researchers to specify what characterizations are needed and what limitations in characterization are acceptable for components of a slice E.g., social role may matter more than physical location Extend definitions to cover challenged networks For example, a “link” may be a data mule How should one usefully characterize a grad student with a backpack full of USB drives? Address disparate levels of what is being delivered How does the experimenter know a bundle has been delivered? What is the definition of successful delivery? Exploit DTN technologies for collection, distribution, and retrieval of measurement data

GENI Measurement Requirements Some relevant requirements GENI System Overview GENI-SE-SY-SO-02.0.doc Sec 10.1 GENI instrumentation and measurement system (GIMS) Ubiquitous deployment No impact High availability Central repository GENI System Requirements Document GENI-SE-SY-RQ-01.9, sec 7 7.1-1: component measurements 7.1-3: link measurements "optical, wired and wireless links” 7.1-7: real-time access to measurements 7.1-8: component locations 7.1-9: time services: "a common timeframe for all measurements, synchronized to within TBD microseconds across the system"