Packet based weighted fair queuing (PBWFQ) in routers is one of the mechanisms commonly available to network operators. PBWFQ can have a considerable impact on the precision of network dimensions, the performance of applications and the efficiency of network troubleshooting procedures. Regardless of its potential impacts, no information on PBWFQ settings is gladly available to end users. In this paper, the method proposes a system-to-system approach and a tool DPET(Distributed Performance Evaluation Tool) to infer router mechanisms through priority aspect. DPET enables users to discover such network policies through dimensions of packet bursts of different packet types. The tool DPET compares with the deduction mechanisms through other metrics such as cost, loss, delay, feasible distance, packet reordering. packet reordering is unable to find many priority paths such as those implemented via traffic policing. On the other hand, amusingly a tool to detect subsistence of the mechanisms which induce delay,cost differences among packet types such as slow processing path in the router and internet header length, code point, port-based weight allocation.
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