Robuste nett

Problem Statement The Internet is to an increasing degree being used for mission critical applications, and the consequences of malfunctions in the infrastructure are severe. There are many threats to a stable infrastructure, including technical problems in the equipment, human errors like misconfiguration of a router, sudden external events like a link being broken by construction work, and even sabotage like Denial of Service attacks or attacks by hackers. When a cable has been broken it is easy to iden tify what the problem is, and the situation is often relatively easy to handle. The situation is far more challenging when each component in the system appears to function well, but some of them do not cooperate properly. This will be the situation with h acker attacks, misconfiguration of components and with some classes of technical faults. One single problematic component can influence on the entire network, and its ability to route packets. In this project we will study network resilience in a broad se nse. In addition to traditional component breakdowns, we will study problems related to misconfigurations and hacker attacks. The Internet is increasingly based on the wireless infrastructure. Wireless local and metropolitan area networks (LAN and MAN) ar e emerging as complimentary technologies to enable the mobile high-capacity Broadband Wireless Access (BWA). While this development opens new possibilities for advanced network services, it also extends the space of possible performance and availability o bstructions. For example, we have to address new challenges in mobility and energy management in addition to the extended scope of the resource and security management. In this project we will study resilience aspects of wireless IP networks. We will iden tify reasons leading to component failures in wireless LAN and MAN, and propose architectures, protocols and algorithms to improve resilience of the future generation BWA.