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This paper proposes a comprehensive yet low-cost solution for online detection and diagnosis of permanent faults in on-chip networks. Using error syndrome collection and packet/flit-counting techniques, high resolution defect diagnosis is feasible in both data path and control logic of the on-chip network. The simulation results show that, the proposed method addresses both data path and control-logic faults and incurs a low area overhead (less than 10%), and without injecting any test traffic or incurring significant performance overhead. For a relatively healthy network, the performance overhead of our method is negligible.