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The attacker first forged the address to initiate a SYN request to the server (can I establish a connection?) The server will respond with an ACK + SYN (Yes + Please confirm). The real IP will think that I did not send the request and did not respond. The server does not receive a response and will retry 3-5 times and drop the connection after waiting for a SYN Time (typically 30 seconds-2 minutes).Multiple Factory Method Patterns《上岸的鱼》及日本电影《龙先生》台湾天才国际童星白润音X金奖影后何子华共飙感人演技。佑佑在初念小学这年，阿嬷骤逝，许多问题因佑佑的北上接踵而至。安琪因花钱如流水而暂时无法支付安亲班费用，最终按摩馆成了佑佑的临时安亲班。调皮的他总给按摩馆带来许多不必要的困扰，引来店经理的不悦。于是，刘黑皮提着灯笼，鲁三也端了盏油灯，一起过东屋查看。他便走到王府东侧门房处，四鬼牵着马跟在后面。The above design error stems from confusing the hierarchical structure of "role" with that of "person" and mistaking "Has-A" for "Is-A". The specific solution is to abstract a role class:"The waist was bitten off? Is the spine broken?" I asked.