CAREER: Network Samaritans (NETSAM): Network-Assisted Service for the Internet

端到端的争论是互联网架构的一项基本原则。然而，互联网的商业化带来了新的要求，如信任、服务质量、服务提供商差异化、第三方参与和不那么老练的用户。这些要求促使人们重新思考端到端原则，以寻求新的互联网架构。过去的经验表明，新建筑的发展可能是一个漫长的过程，充满争议，并将从一个巨大的、往往是未知的解决方案空间中吸取教训。这项研究将调查解决方案空间的一部分，即NetworkAssisted Services作为未来Internet体系结构的可能组件的可行性和适用性。定义了一种称为Network Samaritans(NetSam)的网络协助体系结构来映射此类服务的框架。NetSam的动机是观察到许多新的需求似乎需要网络中的新机制。与主动网络不同，NetSam是朝着增强型网络迈出的温和而谨慎的一步，该网络提供一组超出基本转发的服务，但在精神上与可伸缩的AN网络相去甚远。NetSam通过寻求确定网络中既必要又合适的最低功能来保持互联网的架构精神。NetSam不是一个互联网体系结构，而仅仅是一个以网络辅助为中心的新服务框架，它可能成为未来体系结构的一部分。调查将遵循纪律严明、极简主义的方法，假设除非证明并非如此，否则不需要服务。选定的服务将被分解，其组件将在网络和应用程序之间分布。网络组件将是简单和通用的，因此它们可以很容易地在路由器中实施，安全风险最小。NetSam架构定义了一种新的架构服务划分，即过滤和代理服务。过滤器服务非常简单，通常在路由器中实现，而代理服务则更复杂，通常在边缘实现(但使用转发过滤器的一些帮助)。过滤器和代理服务一起提供灵活性，并支持广泛的服务范围。这项研究将采用自上而下的方法，将网络援助的应用程序隔离开来。将定义简单和通用的服务，候选服务包括分组标记、转向和采样，然后将设计适当的过滤器。系统将通过实现和模拟进行评估。本研究为应用/网络交互提出了一种新的范式，并对知识的推进产生了影响。与目前遵循两者完全分离或结合的范式不同，本研究提出了网络和应用之间的知情交互。这项研究对科学的主要贡献将是管理这种交互的架构。对教育的影响本研究将使学生接触到关于应用/网络交互的理论和实践问题。学生将被要求更深入地思考应用程序和网络之间的区别，重点是理解端到端论点和主动网络等概念。学生将学习分析应用程序要求并考虑路由器辅助服务的优缺点。学生将学习如何定义新的架构。项目作业将要求学生定义新服务及其组成原语的分解和实现。

The end-to-end argument is a fundamental principle of the Internet architecture. The commercializationof the Internet, however, has brought new requirements like trust, QoS, ISP differentiation, third partyinvolvement and less sophisticated users. These requirements have prompted the rethinking of the end-to-endprinciple in a quest for a new Internet architecture. Past experience indicates that the development of anew architecture will likely be a long process, rich with debate and will draw from a vast and often unchartedsolution space. This research will investigate part of the solution space, namely the viability and suitability of NetworkAssisted Services as a possible component of the future Internet architecture. A network-assistance archi-tecture called Network Samaritans (NetSam) is defined to map the framework for such services. NetSam is motivated by the observation that many new requirements seemingly require new mechanisms in the net-work. Unlike Active Networks, NetSam is a moderate, yet careful step towards an enhanced network that provides a set of services beyond basic forwarding, but spiritually very distant from the malleable network of AN. NetSam preserves the architectural spirit of the Internet by seeking to determine the minimum func-tionality that is both necessary and appropriate in the network. NetSam is not an Internet architecture, but merely a framework for new services pivoting on network assistance, which may become part of the future architecture.Approach The study will be carried out in the context of three important applications: Reliable Multicast, Distributed Denial of Service, and Network Management. The investigation will follow a disciplined, minimalist approach, assuming that a service is not needed unless proven otherwise. Selected services will be decom-posed and their components distributed between the network and the application. Network components willbe simple and general so they can be easily implemented in the routers with minimal security risks. The NetSam architecture defines a new architectural division of services, namely filter and surrogateservices. Filter services are very simple and typically implemented in the routers, while surrogate servicesare more complex and typically implemented at the edges (but use some help from forwarding filters).Together, filters and surrogates provide flexibility and support a large spectrum of services. The study will follow a top-down approach by isolating the applications of network assistance. Simpleand general services will be defined, with candidates including packet marking, steering and sampling andthen appropriate filters will be designed. The resulting system will be evaluated through implementation andsimulation.Impact on Advancing Knowledge This research proposes a new paradigm for application/network interaction. Unlike current paradigmsthat follow either complete separation or union of the two, this research proposes informed interactionbetween the network and application. The major contribution of this research to science will be the architecturethat governs this interaction.Impact on Education This research will expose students to both theoretical and practical issues on application/network interaction. Students will be challenged to think deeper about the distinction between the application and the network, with emphasis on understanding concepts like the end-to-end argument and active networking.Students will learn to analyze application requirements and consider the merits and demerits of router-assisted services. Students will learn how to define a new architecture. Project work will task students with the definition of new services and the decomposition and implementation of their constituent primitives.