hand shaking

• In the second section , we deeply discuss and analyze the theory of syn flood attack , memory allocation in tcp 3 hand shakes and different theories of anti this attack , for example , adoption of syn cookie , augment of the max value of tcp backlog and etc .
  深入地讨论和研究了synflood的攻击原理，在tcp连接时涉及到的内存分配和和对各种防御方法的机理，如采用syncookie ，增加tcpbacklog等方法，并对其进行了深入地研究。