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(Update on January 13, 2018)Use-t to specify the table to operate on, and the-P option to specify the chain to modify. In the above example,-P FORWARD DROP means to change the default policy of FORWRD chains in the table to DROP.喜欢用游戏来开玩笑的大学生“精神”、喜欢偶像的怪力妹妹精朱莉，俩兄妹不管遇到幸运或不幸的状况都能用外星人般让人捉摸不定的行动制造出让人啼笑皆非的结果。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.Enter the transaction code COOIS at the command box to enter the "Production Order Information System" view.2. Each receiver analyzes the request and then either processes it or passes it down.