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但就在严世藩死后不久，一封家书竟然传到了苔湾。在她的丈夫李遭謀殺之後，莎拉才開始瞭解到她根本不清楚李的過去。莎拉開始去思考，李到底是什麼樣的人？他在具影響力的全球組織裡擔任什麼職務？以及，為什麼像李這樣的業務員需要佩槍？Let's think about another problem. We have placed a string of rules on each "chain", but some of these rules are very similar. For example, Class A rules filter IP or ports and Class B rules modify messages. At this time, can we put together the rules that realize the same function? We must be able to do so.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.呵呵。公孙匡和梅子寒都赔笑说不敢，见他脸色不好，也不敢多留，立即告退。In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).