A key consideration in building differentiated network services is the fensibitity of maintaining stable and consistent service level agreements across nldtiple networb whemdlocations ammadeoAy on the edges. To investigate this, we consider a game theoretic model of capacity provisioning inadifferentiateds ervicesinterrret. ‘llseplaye rsareoneraw-capaci tyseller per network, one broker per serv...

This document defines an architecture for implementing scalable service differentiation in the Internet. This architecture achieves scalability by aggregating traffic classification state which is conveyed by means of IP-layer packet marking using the DS field [DSFIELD]. Packets are classified and marked to receive a particular per-hop forwarding behavior on routers along their path. Sophistica...

In this paper, the steps taken towards setup and configuration of the DiffServ testbed in our laboratory are listed. A topology is suggested and some simple experimental results for setup validation are presented. A DiffServ domain is deployed and several experiments are run. We obtained acceptable performance for a DiffServ Expedited Forwarding Per Hop Behavior in our testbed using Committed A...

Differentiated services is the most advanced method for traffic management. Differentiated services utilize 6 bits of the 8 bit type of service field of the IP header. This allows up to 64 possible classes. In Differentiated Services this field is referred to as differentiated services code point. Differentiated Services standards define two types of per hop behaviors (PHB’s): Expedited forward...

This paper provides an overview of an implementation of Differentiated Services interior node (a.k.a. core node) as described in the SIMA concept. The core node operation was verified with a series of measurements in a real networking environment. These measurements also give some idea about the level of Quality of Service this kind of mechanism is able to provide.

Optical burst switching (OBS) [1] is a promising all-optical data transport technique to efficiently use the bandwidth offered by wavelength-division multiplexing (WDM) technology. An important issue in OBS networks is how to support quality of service (QoS). Despite the bandwidth availability, a link has at most few tens of wavelengths nowadays. Once, a burst occupies one wavelength, or a frac...

Over the years, quality of service (QoS) has attracted attention from researchers. How to guarantee QoS to customers despite the rapid change of the network status is the main concern. Pricing provides an effective economic means of congestion control and revenue generation. We examine pricing as an effective strategy for revenue management in DiffServ networks. In this paper, we propose an auc...

We consider the setting of a network providing differentiated services. As is often the case in differentiated services, we assume the packets are tagged as either being high or low priority packets. Outgoing links in the network are serviced by a single FIFO queue. Our model gives a benefit of 1 to each high priority packet and a benefit of 1 to each low priority packet. A queue policy control...

There is a huge semantic gap between file system and storage in servicing an I/O request. In a virtual environment the gap increases even more, as the hypervisor’s I/O scheduler is not aware of the semantics of the I/O request that the application issues. To address this limitation and to retain the semantics of the I/O requests in a virtualized environment, we tag each I/O request from the gue...

The Differentiated Services (DiffServ) architecture represents a highly scalable architecture for deployment of QoS across the next-generation Internet. However, the DiffServ model has several key areas of trust critical to its correct operation which represent security concerns. This paper examines those areas of trust and how they apply to security concerns under the DiffServ model. Finally, ...