Chamil Kulatunga

Learn More
Multicast research has explored the security challenges faced in group communications. Multicast transport and multicast security need to work in close collaboration to realise a multicast service. However, there has been comparatively little work to combine the two technologies. In this paper the authors, presenting an example of partially integrating(More)
For many years Internet routers have been designed and benchmarked in ways that encourage the use of large buffers. When these buffers accumulate a large standing queue, this can lead to high network path latency. Two AQM algorithms: PIE and CoDel, have been recently proposed to reduce buffer latency by avoiding the drawbacks of previous AQM algorithms like(More)
To date, QoS solutions that have been developed are confined to enterprise networks due to the scalability problems in inter-domain QoS provisioning. Therefore implementing a service that guarantees end-to-end QoS across the Internet has yet to be fully realised. It is believed that such a service will need to evolve regionally, then nationally and,(More)
Over-provisioned network buffers, often at the Internet edge, induce large queuing delay and high latency; this issue is known as Bufferbloat. In response to this, a set of recently proposed Active Queue Management (AQM) algorithms attempt to reduce standing queues, while maintaining the bottleneck utilisation at an acceptable level. This paper assesses the(More)
Data transmission, such as software update, large file broadcasting and video on demand, can take advantage of the wide coverage and the broadcasting features of the satellite networks. The multicast technologies provide the support for these applications by efficiently using the expensive satellite bandwidth. One of them is the File Delivery over(More)
The emergence of new platforms providing Internet Protocol TeleVision (IPTV) services, such as Google TV and Apple TV is expected to revolutionize the way multimedia services are provided over the Internet. However, the existing network infrastructure falls well short of meeting the resource requirements to provide satisfactory levels of such services. This(More)
CoDel and PIE are recently proposed Active Queue Management (AQM) mechanisms that minimize the time packets spend enqueued at a bottleneck, instantiating shallow, 5 ms to 20 ms buffers with short-term packet burst tolerance. However, shallow buffering causes noticeable TCP performance degradation when a path’s underlying round trip time (RTT) heads above 60(More)