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LINUX: Linux uses the variable tcp_max_syn_backlog to define the maximum half number of connections that the backlog queue can hold. In Redhat 7.3, the value of this variable defaults to 256, which is far from enough. A low-intensity SYN attack can fill up the half-connection queue. We can modify the value of this variable with the following command:故事从灾难发生后一个月左右开始。不同于国外求生的方式，国内封闭式公寓、生活小区的脱险成了主人公吉伦、迦诺、马克共同的难题。食物与饮水的消耗的导致了三人必须尽快冲出丧尸的围困。艰难的逃生使得迦诺难以持续，而对面楼宇独自逃生的马克离双方唯一求生的汽车近在咫尺。主人公吉伦必须 保证已经深陷危险的同伴们至少有一个团结的方式，可信任的建立在这样的世界中是否可以如同往日?整个世界的灾难变化，人类避难所如何建立，可能面对庞大数量的丧尸群，求生与生存的关系，变得更加模糊不清。"Secret" cover. "Xunzi, Fei Twelve Sons": "It is very uncommon and has no class, hidden and no, closed and no solution." Han Cai Yong's "Shu Xing Fu": "I think of Mi Fei's flashes, but God is hidden and hidden." Ye Shengtao's "A Young Man": "This time we must spit out a subtle and hidden mood, express it truthfully, and do not change a little." 2. Refers to a place of concealment. "Han Feizi Six Anti-Japanese": "Fu Chen's light goods are secluded, although his history is suspicious. In a city of hundreds of gold, although the thieves will not take them." 3. Seclusion; Hidden. Han Yan taboo "mourning life": "seclusion is a distant disaster, which can be done." In the Book of Rites, Biao Ji, Tang Kongying Da Shu said, "Although the gentleman's body is hidden and hidden, his morality is hidden and his reputation is remarkable, so the cloud is hidden and obvious." 4. Refers to people who live in seclusion. "Biography of Lang Yi in the Later Han Dynasty": "Changing Yuan Dynasty to a new beginning, seeking seclusion,李南恩是个小镇姑娘，从小热爱中国传统文化。大学毕业后到了英国爱丁堡大学学习建筑学，并阴差阳错进入了“高级动物研究社”。此研究社正在开发一套具有跨时代意义的生态建筑系统名为“空中花园”，而研究社的灵魂人物周尔文 是一个高冷学霸，致力于研究生态环保和建筑的融合。两人互是对方眼中的冷血鳄鱼和恼人鸟，成为冤家。周尔文不仅对南恩的才能有质疑，她推崇的中国传统建筑理念也得不到周尔文的认可，总是高木在一旁当和事佬。经过一段时间的相处和磨合，他们发现各自的理论共通融合以后对“空中花园”有极大益处。毕业后，社员们归国创业，过程中遇到了重重阻碍，但他们越战越勇，通过所学理论，结合国内环境，因地制宜，最后获得巨大成功，带着中国梦，把中国文化下的成果带出了国门，颠覆了全球建筑行业。现在，从遥远的银河尽头来的一位宇宙战士，在新的战场上奔驰！我走了，结局！！几个姐妹正在小屋内享受假期时却遭到了几个戴着面具的闯入者的袭击，她们必须奋力一战才能活过这一夜。