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Ad-Hoc and Delay-Tolerant Networks (AHDTNs) can be very useful in environments where more traditional networking technologies fail. Determining the practical effectiveness of AHDTNs can however be challenging. We review design considerations and practical experience with a novel mechanism for monitoring and analyzing the performance of AHDTNs. This new mechanism, AllNet Trace, somewhat resembles a...
Low latency is a crucial requirement for demanding conferencing applications, such as Networked Music Performance (NMP), the collaboration of musicians in real time. Modern conferencing systems employ a Selective Forwarding Unit (SFU) to transparently duplicate and forward media streams between participants. Since an SFU does not process the media streams, so as to reduce delay, its latency is mainly...
Personal communication devices are extensively used for mobile computing thanks to ever increasing wireless coverage and processing capability. However, they are constrained in terms of both human interaction (screen size and resolution, keyboard) and lifetime; hence mobile computing often relies on the possibility to migrate applications and communication sessions among several (fixed or mobile)...
Commodity hardware can be used to build a software router that is capable of high-speed packet processing while being programmable and extensible. Therefore, software routers provide a cost-efficient alternative to expensive, special hardware routers. The efficiency of packet processing in resource-constrained nodes (e.g. software routers) can be strongly increased through parallel processing with...
Network protocol developers typically go through a tedious and error-prone process of testing and debugging their protocol implementation for various settings. They perform a number of tasks manually such as configuration of numerous network settings, controlled reproduction of unexpected protocol behavior, and traffic capture and analysis. We present a Protocol Testing and Evaluation System (PTES)...
Automated geolocation of IP addresses has important applications to targeted delivery of local news, advertising and other content over the Internet. Previous measurement-based approaches to geolocation employ active probing to measure delays among a set of landmark nodes with known locations. The location of a target IP address can be approximated by that of the nearest landmark, as determined by...
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