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                            ## 六、NAT網關
1. NAT是什么？
私有IP地址與公共IP地址的映射
```
兩大類：
SNAT----訪問互聯網
DNAT----被互聯訪問到
```
**NAT網關——SNAT**
> 例子：類似老式公共電話，大家用一個公共電話通信，用的人多了，就有公共電話亭。
> 
![](https://img.kancloud.cn/13/db/13db1231af57001c7a7be870ab9296df_1335x702.png)

**NAT網關——DNAT**
> 例子：類似一個公共平臺，對外界人員提供的服務（我們需要去聯系他們，他們不會主動聯系我們的。）
> 
![](https://img.kancloud.cn/95/9e/959e88b8b71c534f5a9f201e77a66cf0_1335x702.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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