Abstract:Abstract:There are some shortcomings of the methods commonly used in defense of SYN Flood attack. In terms of attack simulation test, I designed a defense system to SYN Flood attack. Firstly, the article introduced the principle of SYN Flood attack, and then put forward the design and realization of the defense system, on this basis, according to the objectives and content of the defense attacks test, carried out the simulation attack and defense; and at last introduced the implementation of the attack and defense in detail. The experimental results showed that this system can be an effective defense to SYN Flood attack, and had certain practical value.