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Take synkill. Exe as an example. Run the tool, select the random source address and source port, fill in the target machine address and TCP port, activate the operation, and soon find that the target system is running slowly. If the attack effect is not obvious, it may be that the target machine does not open the filled TCP port or the firewall denies access to the port. At this time, you can select the TCP port that is allowed to access. Generally, Windows systems open ports tcp139 and UNIX systems open ports tcp7, 21, 23, etc.　　我们力求作出让每一个经历了这三十年的中国人都有共鸣，都能看到自己屡败屡战的影子，所以这是一部励志片！你在搞什么……吴琳琳又递给尹文倩几张纸巾。　　就读北宇治高中的铠塚霙（种崎敦美 配音），在管乐团中负责吹奏双簧管；伞木希美（东山奈央 配音） 则负责吹奏长笛。国中时，希美主动对孤单的霙搭话，从那刻起霙就将希美视为自己的全世界。霙现在每天都感到很幸福，因为有希美在身边陪伴她，但同时也害怕希美是否会再次消失在自己面前……是啊。In order to use SYN? Cookies to calculate the SYN-ACK serial number (that is, SYN? Cookies), the host must first combine some local password bits, a data structure including IP address and TCP port number, SYN initial sequence number, and some index data identifying the password bits. An MD5 digest is generated on top of all the above bytes, and then some bits are truncated from the hash value to put it into the SYN-ACK sequence number. Since the size of the sequence number is about a quarter of the total hash value, this truncation is necessary, but usually at least 3 bytes of hash bits are used for verification, which means that there are still nearly 2 24 possibilities to guess and verify cookies without knowing the password bits. In order to send out the hash value, some bits of cookies will reduce the upper limit value of MSS (Maximum Segment Length) contained in SYN and affect the index bits that identify the native password bits in the hash value.