The successful operation of a peer-to-peer network depends on the resilience of its peer’s communications. On the Internet, direct connections between peers are often limited by restrictions like NATs and traffic filtering. Addressing such problems is particularly pressing for peer-to-peer networks that do not wish to rely on any trusted infrastructure, which might otherwise help the participan...

Metadata for the World Wide Web are important, but metadata for Peer-to-Peer (P2P) networks are absolutely crucial. In this paper we discuss the open source project Edutella, which combines semantic web and peer-to-peer technologies in order to make distributed learning repositories possible and useful. We describe the main services of the Edutella network infrastructure and its architecture ba...

Due to increasing numbers of students at German universities large-scale learning services are still a common default. These learning services lack interaction as well as feedback to assess learners’ knowledge on the cognitive levels of educational objectives. This situation is alarming, since interaction and feedback in order to assess the own learning progress are important factors for indivi...