The Quantized Congestion Notification (QCN) is a Layer 2 congestion control scheme for Carrier Ethernet data center networks. The QCN has been standardized as an IEEE 802.1Qau Ethernet Congestion Notification standard. This paper report a results of a QCN study with multicast traffic and proposes an enhancement to the QCN. In fact, in order to be able to scale up, the feedback implosion problem...

Extension of components should be consistent in the sense that the extending component does not introduce any unexpected behaviour. We formulate requirements which allow consistent extension of components in presence of explicit invariants. We concentrate on the issue of extension consistency with forwarding as the reuse mechanism, and discuss the additional problems which require solution when...

Network bandwidth denial of service (DoS) attacks seek to consume the available bandwidth or router resources at or near a target host or network, such that legitimate traffic cannot reach its destination. The primary means for achieving this goal by sending large traffic volumes (packet floods) that do not respect congestion control signals, such as that in the Transmission Control Protocol (T...

TCP was designed and tuned to work well on networks where losses are mainly congestion losses. The performance of TCP decreases dramatically when a TCP connection traverses a wireless link on which packets may be lost due to wireless transmission errors. Explicit Congestion Notification (ECN) is known as an effective mechanism that can be used with Active Queue Management (e.g. RED) to control ...

The objective of Pre-Congestion Notification (PCN) is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain. The overall rate of PCN-traffic is metered on every link in the PCNdomain, and PCN-packets are appropriately marked when certain configured rates are exceeded. Egress nodes pass information about these PCN-marks to Decision Points that then decide whether to...

Explicit Congestion Notification (ECN) transfers a clear indication of congestion through the network and, therefore, gives a possibility to construct closed-loop control of effective transmission rate. In the paper, a simulation model of ECN-capable multicast multimedia delivery in ns-2 environment is discussed. The model includes complete ECN-capable network infrastructure (sender, receivers,...

TCP was designed and tuned to work well on networks where losses are mainly congestion losses. The performance of TCP decreases dramatically when a TCP connection traverses a wireless link on which packets may be lost due to wireless transmission errors. Explicit Congestion Notification (ECN) is known as an effective mechanism that can be used with Active Queue Management (e.g. RED) to control ...

This paper proposes the use of congestion pricing for achieving relative service differentiation in satellite IP networks. The idea is to use congestion pricing as an effective approach to control traffic rate for Transmission Control Protocol (TCP) flows, with Explicit Congestion Notification as a congestion feedback mechanism, by taking into account network users’ willingness-to-pay. With mul...

We develop a simulation model for the ATM ABR service, and use it to engineer ABR congestion control behavior. Although significant work has been performed on ABR rate allocation algorithms at network switches, little work has focused on the end system behavior, which we examine in this paper. The effect of the speed of links on the path from the source to the destination, and the connection ro...

The objective of the Pre-Congestion Notification (PCN) architecture is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain. It achieves this by marking packets belonging to PCN-flows when the rate of traffic exceeds certain configured thresholds on links in the domain. These marks can then be evaluated to determine how close the domain is to being congested. This...