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The attacker first forged the address to initiate a SYN request to the server (can I establish a connection?) The server will respond with an ACK + SYN (Yes + Please confirm). The real IP will think that I did not send the request and did not respond. The server does not receive a response and will retry 3-5 times and drop the connection after waiting for a SYN Time (typically 30 seconds-2 minutes).　　著名纪录片导演肯·伯恩斯的越南战争纪录片，于2017年在美国PBS电视台播出，共10集，总时长有18小时，采访了来自各方的近80名亲历者，既有参战与反战的美国人，也有南越与北越的军民。本片历经十年制作，跨遍全球搜集资料，其中有许多少见和重新数字化的影像档案，还有20世纪最为出名的摄影照片和家庭影视，以及历史新闻片段和政府内部的秘密录音。反正我也不急着回去，就当散散步。瓦夫人大笑道，我们也没有办法，路过哪里，都不让我们进城，就算进城，也要等十天半个月的狗屁文书，等到了文书，也拿些根本入不了口的东西打发我族2. When pilotage ships do not perform pilotage tasks, they shall display the lights or types specified for similar ships of the same length. However, all possible measures as permitted by Article 36 shall be taken to indicate the nature of the relationship between the towing vessel and the towed vessel.