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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).南宋年间，宋高宗听信秦桧的谗言，以莫须有的罪名杀害岳飞，韩世忠辞官。秦桧结党营私，只手遮天，令亲者痛，仇者快。多名前朝元老聚合民间资源，组成“豪侠”，结合多名武林中奇能异士，与秦桧对抗，但第一笔巨款，在托运时竟然失踪。押运巨款的“豪侠”，全数遇害……两人问了农人去京城的方向，在乡间小路上走了好久，直到日上三竿，还没看见通往京城的大路。也算是一个明智的选择吧。于是，姜二姑娘的贴身丫头翠凤就被叫来了。霍啸林得罪了保安司令赵金虎，逃出西阳。赵金虎化妆成土匪杀了霍啸林全家。霍啸林拜师习武伪装使诈，在梅姑娘的配合下刺杀了赵金虎。霍啸林与梅姑娘有情却无法一起逃走，从此天各一方。霍啸林闯荡江湖，在汉口变成了一个为了生存可以随时杀人的黑帮。梅姑娘如幻影般出现又如在梦境中消失，只有当霍啸林遇到困难的时候，他才能发现梅姑娘的存在。结识了共产党人韩亲仁，霍啸林终于明白自己走上了歧途，他决定带着全家离开汉口回热河老家。1933年热河抗战爆发，霍啸林不忍看着中华大地惨遭侵略者铁蹄践踏，成立热河义勇军，天下闻名。韩亲仁、梅姑娘都来到热河，以不同形式支持着抗日义勇军。日本侵略者专门从东京调来生化部队，对付他们永远无法战胜的霍啸林。为了让全世界都知道面对侵略者的屠刀有人在抵抗，霍啸林决定抛妻弃子、以身报国。