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十年浩劫接近尾声，神鬼各归其位。自幼在老北京胡同里长大的韩春明（朱亚文 饰）返城归来，在周转与工作的过程中，还与同院儿的美丽姑娘苏萌（边潇潇 饰）和好哥们程建军（朱铁 饰）发展出一段剪不断理还乱的三角恋情。在程的捣乱和命运的安排下，有情人春明和苏萌的距离越来越远，而他因缘际会拜关大爷（倪大红 饰）为师，靠倒腾破烂中的值钱玩意渐渐发家。此去经年，市场搞活，改革开放的热潮让全国上下起了翻天覆地的变化，大学毕业生苏萌和收破烂的韩春明兜兜转转，若即若离，而程建军对春明的嫉恨与日俱增，时刻要将其彻底打翻。Private void atfer () {When the SYN gateway receives the SYN packet from the client, it directly forwards it to the server. After receiving the SYN/ACK packet from the server, the SYN gateway forwards the packet to the client and sends the ACK confirmation packet to the server in the name of the client. At this time, the server enters the connected state from the semi-connected state. When the client confirms the arrival of the packet, it forwards if there is data, otherwise it discards it. In fact, the server has a connection queue in addition to maintaining the semi-connection queue. If SYN attack occurs, the number of connection queues will increase, but the number of connections that the general server can withstand is much larger than the number of semi-connections, so this method can effectively reduce the attack on the server.After the INPUT chain is emptied, there are no rules for the INPUT chain in the filter table, but it can be seen that the default policy of the INPUT chain is ACCEPT, that is, the INPUT chain "releases" all messages sent to the local machine by default, accepts all messages when there are no rules, and releases messages by default when the messages are not matched by any rules.Episode 35