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The other two schemes are based on SYN cache and SYN? Cookies (see 6.4), simplifies the state initialized when the TCB is generated by receiving the SYN, and delays the instantiation of the full state [4]. In hosts that use SYN caching, a HASH tablespace with a limited size is used to store a subset of data that will be allocated to the TCB. If the ACK is received when the handshake is completed, the data will be copied into a complete TCB, otherwise HASH values exceeding the lifetime will be recycled when needed. In Lemon's FreeBSD, the SYN cache is 160 bytes for a half-open connection, while a full TCB is 736 bytes and supports 15,359 SYN cache spaces.花果山的两魔王青灵和翩翩因争夺一颗共同修炼的“慧丹”打斗起来，不慎，慧丹掉入一石之中。石头轰然迸裂，惊天动地，化出一灵敏聪慧的小石猴，青灵翩翩眼见修炼成果化为乌有，生出一只小石猴，便与石猴结拜，兄妹相称。According to the above introduction, DDoS attacks need to obtain a large number of broilers, but it is becoming more and more difficult to obtain broilers. Is there any way to attack a large number of broilers without controlling broilers? DRDoS (Distributed Reflection Denial of Service), an attacker will not send the request directly to the attacker, but will send it to a third party through which to transfer it to the attacker, which is the embodiment of "Reflection". Its process is as follows: the attacker tampers the source IP of the request packet with the IP to be attacked, and the target IP is the third-party IP, then the target IP of the third-party recovery message becomes the IP of the attacker, thus the attacker will receive a large number of requests and the service is unavailable.杰西卡遭遇高智商精神病人，她和崔西必须修复她们破裂的关系，联合起来对付他。但一场灾难性的失败揭示了她们对于英雄主义的看法充满了矛盾，并迫使她们走上了一条永远改变俩人的冲突之路。现在，《武侠世界》杂志每期都卖到脱销，网上随处可见在讨论《倚天》的。However, in the actual use process, Rules are often defined through "tables" as operators. The reason why iptables are introduced according to the above process is that it is easier to understand them from the perspective of "checkpoints" and from the perspective of entry. However, in order to understand them more smoothly in actual use, we also list the relationship between each "table" and "chain" here.