A Linux Implementation of a Differentiated Services Router

Abstract

Abstract. The Internet Engineering Task Force (IETF) is currently working on the development of Differentiated Services (DiffServ). DiffServ seems to be a promising technology for next-generation IP networks supporting Quality-ofServices (QoS). Emerging applications such as IP telephony and time-critical business applications can benefit significantly from the DiffServ approach since the current Internet often can not provide the required QoS. This paper describes an implementation of Differentiated Services for Linux routers and end systems. The implementation is based on the Linux traffic control package and is, therefore, very flexible. It can be used in different network environments as first-hop, boundary or interior router for Differentiated Services. In addition to the implementation architecture, the paper describes performance results demonstrating the usefulness of the DiffServ concept in general and the implementation in particular.

Using the script MIB for policy-based configuration management

“…We tested this implementation in a DiffServ test-bed containing Linux routers with the NEC Linux DiffServ implementation [20] developed jointly with the University of Bern. The local driver translates calls from DiffServ Java configuration methods into a respective set of commands and profile updates.…”

Implementation of differentiated services over ATM

“…On the other side, VP policing should be configured at ISP1. [5]. Packets are forwarded to a device, classified, processed by a service handler, which may include marking, shaping, or policing, and queued for transmission.…”

An adaptive IP telephony application over Differentiated Services

“…These include the DS codepoint of outgoing packets and the packets' payload format and size. The DS codepoints correspond to the ones from [13] and select either Best-Effort, four Assured Service classes (aka Assured Forwarding) with increasing QoS guarantees, or Premium Service (aka Expedited Forwarding). Additionally, the pseudo codepoint IGNORE can be used, causing DSPhone to use the system default.…”