  The production of a large-scale monitoring system for a high-speed network
leads to a number of challenges. These challenges are not purely techinical but
also socio-political and legal. The number of stakeholders in a such a
monitoring activity is large including the network operators, the users, the
equipment manufacturers and of course the monitoring researchers. The MASTS
project (Measurement at All Scales in Time and Space) was created to instrument
the high-speed JANET Lightpath network, and has been extended to incorporate
other paths supported by JANET(UK).
  Challenges the project has faced have included: simple access to the network;
legal issues involved in the storage and dissemination of the captured
information, which may be personal; the volume of data captured and the rate at
which this data appears at store. To this end the MASTS system will have
established four monitoring points each capturing packets on a high speed link.
Traffic header data will be continuously collected, anonymised, indexed, stored
and made available to the research community. A legal framework for the capture
and storage of network measurement data has been developed which allows the
anonymised IP traces to be used for research pur poses.
