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Dead-peer-detection example T+0 Notify IP1, IP2 t+9.1 Ack packet t+1 DPD packet to IP1 t+2 DPD packet to IP1 t+4 DPD packet to IP1 t+8 DPD packet to IP2 t+9 DPD packet to IP2 t+9.2 Start using IP2 Unreachable Unreachable Unreachable Lost |