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NetServ Dynamic in-network service deployment

NetServ Dynamic in-network service deployment. Henning Schulzrinne (Columbia University) Srinivasan Seetharaman (Georgia Tech) Volker Hilt (Bell Labs). NetServ overview. Extensible architecture for core network services. Modularization Building Blocks Service Modules

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NetServ Dynamic in-network service deployment

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  1. NetServDynamic in-network service deployment Henning Schulzrinne (Columbia University) Srinivasan Seetharaman (Georgia Tech) Volker Hilt (Bell Labs)

  2. NetServ overview Extensible architecture for core network services • Modularization • Building Blocks • Service Modules • Virtual services framework • Security • Portability No more ossification in NGI

  3. How is NetServ different from Active Networks? • Active Networks • Packet contains executable code • Can modify router states and behavior • Not successful • Per-packet processing too expensive • Security concerns • No compelling killer app to warrant such a big shift • Notable work: ANTS, Janos, Switchware • NetServ • Virtualized services on current, passive networks • Service invocation is signaling driven, not packet driven • Service modules are stand-alone, addressable entities • Separate from packet forwarding plane • Extensible plug-in architecture

  4. Building Blocks • Key components of network services • Access to network-level resource • Implementation of common functionality • For example: • Link monitoring and measurement • Routing table • Packet capture • Data storage and lookup

  5. Service Modules • Full-fledged service implementations • Use Building Blocks and other Service Modules • Can be implemented across multiple nodes • Invoked by applications • Examples: • Routing-related services • Multicast, anycast, QoS-based routing • Monitoring services • Link & system status, network topology • Identity services • Naming, security • Traffic engineering services • CDN, redundancy elimination, p2p network support

  6. Virtual Services Framework • Container for Service Modules • Security by module isolation (sandboxes) • Portability by virtualization and common API to Building Blocks • Features • Dynamic distribution of modules • Network service discovery • AAA mechanisms • Wide-range of nodes: routers, servers, PCs, set-top boxes

  7. Research objectives • Define requirements for service-oriented Internet architecture • Design architectural framework for virtualized services • Identify key building blocks • Develop service discovery and distribution mechanisms • Develop a content distribution service as a showcase application

  8. Content Distribution Service:our showcase application • CDN, the current kludge • IP address conflates identity and location • DNS abuse to get around it • Content Distribution Service on NetServ Framework • Based on generalized naming service module • Ideas borrowed from other NGI proposals • Also relies on network monitoring service module • Together with policy info, underlies naming resolution • Evaluation on GENI

  9. Our initial approach • Series of rapid prototyping cycles • Identify technical challenges early on • Start project with code rather than documents and slides

  10. Service Modules Building Blocks written in Java Building Blocks written in Java Building Blocks written in C/C++ (library functions and/or system calls) NetServ prototype technology overview Virtual Services Framework in Java using OSGi Java Native Interface (JNI) wrapper • Click Modular Router • (user or kernel mode)

  11. Prototype technology:Click router • Runs as a Linux kernel module or user-level program • Modules written in C++ (called Elements) are configured in a text file • Elements are arranged in a directed graph, through which packets traverse • Example: • Click router command: sudo click example.click • Configuration file jae.click: FromDevice(en0)->CheckIPHeader(14)->IPPrint->Discard; • http://www.read.cs.ucla.edu/click/

  12. Prototype technology: OSGi • Dynamic module system for Java • Modules loaded and unloaded at runtime • Bundle: self-contained JAR file with specific structure • Open-source implementations: Apache Felix, Eclipse Equinox • Security and accounting • Security built on Java 2 Security model • Permission-based access control • No fine-grained control or accounting for CPU, storage, bandwidth • Can load native code with appropriate permission • Strict separation of bundles • Classpath set up by Bundle class loader • Inter-bundle communication only through published interfaces

  13. 1st prototype implementation Privileged System Bundle (Java) App Bundle (Java) Java Native Interface (JNI) Published interface Equinox open-source OSGi framework Java Virtual Machine Packet queue NetServ Click element in C++ - starts up a JVM packet User-level Click router Single process

  14. Summary • NetServ • Architecture for dynamic in-network service deployment • Modular and extensible • Building Blocks and Service Modules • Secure and portable • Virtualized Services Framework • And it is NOT Active Networks • Content Distribution Service • Our planned showcase application • Our initial approach • Rapid prototyping cycles • Implementation using Click and OSGi

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