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请教各位工程师,路由和终端互相发送的问题

情况是这样的,终端能给路由发送数据,路由也可以给终端发送数据,但是路由收到终端发送的数据后立刻返回时,就不行,终端收到路由数据后立刻返回也不行,终端就要重组网。有什么办法么