目前我们仅从IP头读取源IP。但ICMP消息本身从第20字节开始，其首字节为类型字段。我们完全忽略了该字段，因此traceroute不知道何时终止。如果检查缓冲区[20]，就能区分类型11（超时，表示途经路由器）和类型3（目标不可达，表示已抵达）。
Under the original Artemis architecture, NASA planned on multiple versions of the SLS rocket, ranging from the "Block 1" vehicle currently in use to a more powerful EUS-equipped Block 1B and eventually an even bigger Block 2 model using advanced solid rocket boosters. The latter two versions required use of a taller mobile launch gantry, already well under construction at the Kennedy Space Center.
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