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This paper presents our design and tests of a realtime network monitoring program for DeSiDeRaTa, an existing resource management system. This monitor will assist DeSiDeRaTa in maintaining an acceptable Quality of Service (QoS) for groups of real-time applications by reporting the communication delays caused by inadequate network bandwidth. The network monitoring application we developed uses SNMP and network topology information gleaned from the DeSiDeRaTa application specification files. Network bandwidth utilization of each real-time communication path is computed, and experiments have been run to demonstrate the accuracy of these measurements.