例如，返回TTL值为119，那么可以推算数据包离开源地址的TTL起始值为128，而源地点到目标地点要通过9个路由器网段（128-119）；如果返回TTL值为246，TTL起始值就是256，源地点到目标地点要通过9个路由器网段。

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Every time Devon publishes a story, you’ll get an alert straight to your inbox! Enter your email By clicking “Sign up”, you agree to receive emails from ...

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