当所经过的路由器的路由表中具有到达目标的路由,而目标因为其它原因不可到达,这时候会出现"Request timed out",如果路由表中连到达目标的路由都没有,那就会出现"destination host unreachable"。 文章转载自:http://blog.csdn.net/mosquitolxw/article/details/6537105
“Request timed out”与“Destination host unreachable”的区别
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