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no router reply

請問,

我有一個Gateway 建立網路後,分別讓Router 加入網路再讓End-Device也加入網路.

End-Device -->  Router --> Gateway 

Gateway 會連續發送幾次 Router Request, Router 收到第一個Router Request 後, 會轉發並且回 Router reply,

但收到第二個、第三個  Router Request 時, 就沒回Router reply, 請問是什麼原因?