Abstract: A user interface for a protocol analyzer or similar network management software product provides a graphical representation of the behavior of packets in a packet trace with respect to time, graphically showing a transmission time, source node and destination node. In a preferred implementation, the user interface, called a “bounce diagram,” contains a time axis, and a number of node lines parallel thereto, each node line associated with a node label for a node in the packet trace. Each packet in the packet trace is represented by a packet arrow which extends from a node line for the source node to a node line for the destination node of the packet. The packet arrow is preferably color coded to indicate the size of the packet. Preferably, there is a packet density graph which indicates in each time interval a number or percentage of packets of the packet trace transmitted during the time interval.