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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.Well, this article has already summarized how to add, delete and modify iptables rules. Combined with the previous article, we have mastered the "add, delete, change and check" of iptables rules. At the same time, this article has also summarized how to set the default strategy of the chain and how to save iptables rules.小葱又扑了个空，心中难受，略跟他叙了一会，便托他向镇南侯顾涧问好，然后就拱手告辞了她就低头吃饭，不时地又抬头看他一眼。迈克尔·基顿将主演Hulu8集限定剧《成瘾剂量》(Dopesick,暂译)。丹尼·斯特朗([规则改变])担任剧集运作人与编剧,巴瑞·莱文森([死亡医生])执导。该剧根据BethMacy撰写的同名畅销书改编,基顿扮演老派医生塞缪尔·芬尼克斯,他以仁慈和同情心对待自己的工作,但他发现自己陷入了大制药公司致命的秘密之中。(1) The utility model provides a low-temperature stop valve, wherein a guide sleeve is added at the valve disc, and is fixed by bolts and elastic pads, so as to position and guide the seal of the valve; ;