# NAT评分

#### **NAT评分**$$M\_N$$

NAT（网络地址转换）类型直接影响着连接质量和稳定性，因此，为不同的NAT类型设置了相应的积分奖励：

公网IP = 1.5

NAT 1  = 1.4

NAT 2  = 1.3

NAT 3  = 1.1

NAT 4  = 1

#### 关于NAT的补充信息 

**NAT1:** Full Cone NAT，全锥形NAT，这是最宽松的网络环境，你想做什么，基本没有限制，IP和端口都不受限。 

**NAT2:** Address-Restricted Cone NAT，受限锥型NAT，相比NAT1，NAT2 增加了地址限制，也就是IP受限，而端口不受限。 

**NAT3:** Port-Restricted Cone NAT，端口受限锥型，相比NAT2，NAT3 又增加了端口限制，也就是说IP、端口都受限。 

**NAT4:** Symmetric NAT，对称型NAT，对称型NAT具有端口受限锥型的受限特性，内部地址每一次请求一个特定的外部地址，都可能会绑定到一个新的端口号。也就是请求不同的外部地址映射的端口号是可能不同的。这种类型基本上就告别 P2P 了。


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