The panOULU (public access network OULU) network provides wireless broadband Internet access to everybody in its coverage area . The panOULU network is provided in cooperation by the City of Oulu, the University of Oulu, the Oulu University of Applied Sciences, the Pulmonary Association Heli, the VTT Technical Research Centre of Finland, DNA Oy, Elisa Oyj, and Netplaza Oy.

The panOULU network is accessed by over 15 000 unique devices per month. We have built an extremely cost-efficient wireless network which covers the city centrum, the airport, public libraries, schools, buses and even a ferry. To avoid complexity and to enable seamless roaming, panOULU is a single large L2-network. While this approach has many advantages, it has one disadvantage: failures in certain parts of the network can propagate to affect all users. We have tackled this problem by using Clarified Analyzer to quickly detect and debug network problems. With the time travel feature we are also able to debug sporadic failures that we could not otherwise debug while the failure was ongoing.

-- Timo Ojala, Dr.Tech.