CAREER: Flexible Networks with Source Control

软件定义网络等新技术正在改变网络格局，使各个域（如ISP）能够灵活控制其路由器的行为。 然而，互联网的域间路由体系结构，它需要域之间的协调，仍然陷入困境。 事实上，互联网架构的许多关键缺陷-包括不可靠、资源分配效率低下和不安全-在很大程度上可以归因于路由不灵活。互联网的BGP和IP协议只提供一条通往每个目的地的路径，而这条路径可能是断开的、低效的或不安全的。 为了突破目前路由不灵活的僵局，该项目正在推进源代码控制路由（SCR）作为一种架构方法，以从根本上实现更灵活的路由。路由决策不是将路由决策嵌入网络中，而是在源处选择的网络的参数，即，用户的设备或代表其行事的设备。这种灵活性为多种问题提供了解决方案，包括可靠性、性能和防止某些流量吸引攻击。为了实现可行的SCR架构，该项目正在解决三个关键挑战：核心架构的策略灵活性;安全性;和可扩展性。 首先，虽然过去的SCR架构将路由控制权交给了用户，但它们从网络所有者和运营商手中夺走了控制权。 关键的需求是架构中的“策略灵活性”，以在不限制网络所有者控制的情况下启用SCR。 该项目正在开发一个正式的政策灵活性理论，并设计一个架构，实现高政策的灵活性。其次，该项目正在量化SCR架构对拒绝服务攻击的脆弱性，并开发技术来限制攻击者可能造成的最坏情况的损害。 第三，该项目正在开发技术，使源以可扩展的方式利用灵活的路由，改善Internet通信的延迟和可靠性。更广泛的影响。该项目的结果将是一个Internet架构的理论基础，设计和实现，为当今Internet最关键的挑战领域提供重大收益-包括可靠性，性能和安全性。 该项目的理论基础的研究方法，包括一个新的协议灵活性理论，将通过研究生水平的“计算机网络理论”课程和调查论文的材料开发与教育相结合。结果将通过出版物、演示文稿和公共软件发布进行传播。

Novel technologies such as software defined networking are changing the networking landscape by giving individual domains (such as ISPs) flexible control over their routers' behavior. Yet the Internet's interdomain routing architecture, which requires coordination among domains, remains mired in inflexibility. Indeed, many of the key shortcomings of the Internet's architecture --- including unreliability, inefficient resource allocation, and insecurity --- can be attributed in large part to inflexible routing. The Internet's BGP and IP protocols offer only a single path to each destination, and this path may be broken, inefficient, or insecure.This project is developing an approach to bring flexibility to the Internet's routing and forwarding architecture. To break through the current logjam of inflexible routing, the project is advancing source-controlled routing (SCR) as an architectural approach to enable fundamentally more flexible routing. Rather than embedding the routing decisions within the network, routing decisions are a parameter to the network chosen at the source, i.e., the user's device or one acting on its behalf. That flexibility yields solutions to multiple problems, including reliability, performance, and protection from certain traffic attraction attacks.To achieve a viable SCR architecture, the project is solving three key challenges: policy flexibility of the core architecture; security; and scalability. First, while past SCR architectures gave route control to users, they took away control from network owners and operators. The key need is "policy flexibility" in the architecture, to enable SCR without limiting network owners' control. The project is developing a formal theory of policy flexibility and designing an architecture which achieves high policy flexibility. Second, the project is quantifying the vulnerability of SCR architectures to denial-of-service attacks and developing techniques to limit the worst-case damage attackers can inflict. Third, the project is developing techniques for sources to utilize flexible routing in a scalable way, improving latency and reliability of Internet communications.Broader Impact.The result of this project will be the theoretical foundations, design, and implementation of an Internet architecture that offers significant gains to areas which are the most critical challenges for the Internet today --- including reliability, performance, and security. The project's theoretically-grounded research methodology, including a novel theory of protocol flexibility, will be integrated with education via development of material for a graduate-level "Theory of Computer Networks" course and survey papers. Results will be disseminated through publications, presentations, and a public software release.