IP欺骗的技术比较复杂，不是简单地照猫画老虎就能掌握，但作为常规攻击手段，有必要理解其原理，至少有利于自己的安全防范，易守难攻嘛。-IP spoofing technique is more complex, not simply according to the tiger cat picture can master, but as a conventional means of attack, it is necessary to understand its principles, at least in favor of their own security, easily defensible thing.