Quality Of Service In IP Networks Research Articles

A new protocol for security and QoS in IP networks

To effectively manage network resources and to serve different traffic needs, several studies have been done in the Quality of Service (QoS) area. Basically, 'Multi-Field' (MF) packet classifiers classify a packet by looking for multiple fields of the IP-TCP headers, recognise which flow the packet belongs to, and according to this information, provide service differentiation in IP networks. However, for security purposes, existing security protocols (such as the IPSec ESP) hide much of this information in their encrypted payloads, preventing network control devices such as routers and switches from utilising this information in performing classification appropriately. The ESPQ protocol deals with this problem but it has some security weaknesses. In this paper, we present the ESPQ vulnerabilities and we propose QoS-friendly Encapsulated Security Payload (Q-ESP) as a security protocol that provides both security and QoS support.

Admission control in Flow-Aware Networking (FAN) architectures under GridFTP traffic

Computing and networking resources virtualization is the main objective of Grid services. Such a concept is already used in the context of Web-services on the Internet. In the next few years, a large number of applications belonging to various domains (biotechnology, banking, finance, car and aircraft manufacturing, nuclear energy etc.) will also benefit from Grid services. Admission control is a key functionality for Quality of Service (QoS) provision in IP networks, and more specifically for Grid services provision. Service differentiation (DS) is a widely deployed technique on the Internet. It operates at the packet level on a best-effort mode. Flow-Aware Networking (FAN) that operates at the scale of the IP flows relies on implicit flow differentiation through priority fair queuing (PFQ). It may be seen as an alternative to DS. A Grid session may be seen as a succession of parallel TCP/IP flows characterized by data transfers with much larger volume than usual TCP/IP flows. In this paper, we propose an extension of FAN for the Grid environment called Grid over FAN (GoFAN). We compare, by means of computer simulations, the efficiency of Grid over DS (GoDS) and GoFAN. Two variants of GoFAN architectures based on different fair queuing algorithms are considered. As a first step, we provide two short surveys on QoS for Grid environment and on QoS in IP networks respectively.