NeTS-FIND: Session Layer Management of Network Intermediaries

DuchampISP和服务提供商已经以越来越快的频率部署了各种形式的网络中介。 这些部署的结果是一个由离散子网组成的互联网，连接在相对较少的阻塞点上，缺乏普遍的可寻址性，并包括有状态的网络中介作为重要组件。 这项工作开发了一种新的技术机制-一个新的“会话层”的定义-作为一种管理新的复杂性的方法，恢复了原来同构模型失去的一些好处，并开辟了各种新的可能性。 应用程序的每个端点都可以指定它希望、允许或禁止哪些中间服务存在于它与其他应用程序端点之间的路径上。会话层在一系列传输连接上运行。 每个中介都被显式地寻址，允许它位于Internet中的任何位置。 会话层验证端到端传递，提供各种语义。 会话可以在更改底层传输参数（包括更改端点的IP地址）后继续存在。更广泛的影响：会话层提供的额外间接层承诺了许多好处。 其中包括应用程序和中间服务的更清洁的编程模式;更容易部署中间服务;简化物理网络设计;提高单个会话的性能;减少整个互联网的拥塞和更大的带宽利用率;更好的容错和容错能力;以及启用重要的新服务。

0626683 DuchampISPs and service providers have deployed various forms of network intermediaries with accelerating frequency. The result of these deployments is an Internet composed of discrete subnetworks, attached at a relatively small number of choke points, lacking universal addressability, and including stateful in-network intermediaries as vital components. This work develops a novel technical mechanism---a new definition of the ``session layer''---as a way to manage the new complexity, retrieve some of the lost benefits of the original homogeneous model, and open a variety of new possibilities.A session layer protocol allows endpoints to become aware of and manage intermediate services. Each endpoint of an application can specify which intermediate services it desires, permits, or prohibits to exist along the path between it and the other application endpoint.The session layer runs over a sequence of transport connections. Each intermediary is explicitly addressed, allowing it to be located anywhere in the Internet. The session layer verifies end-to-end delivery, offering a variety of semantics. A session can survive a change to the underlying transport parameters, including change of an endpoint's IP address.Broader Impact: The extra layer of indirection provided by the session layer promises many benefits. Among them are a cleaner programming model for both applications and intermediate services; easier deployment of intermediate services; simplified physical network design; improved performance of an individual session; reduced congestion and greater bandwidth utilization for the Internet as a whole; better fault tolerance and manageability; and the enabling of important new services.