计算机网络-第4章 4.4.3-网际协议-DHCP和NAT-同步电大进度

「爱情、让人受尽委屈。」 2023-01-15 05:56 125阅读 0赞

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假定一个家庭网络中的拓扑结构如下图所示，其内部网络为192.168.1.0/24，路由器的WAN端口的地址为202.38.75.11/24，这是一个全局IP地址，假设PC1和PC2上分别向服务器202.113.16.34/24的80端口发起2个TCP连接，则在路由器R上需要建立4个对应的NAT转换表项，假设在PC1、PC2上的端口号分别为3000~3003，NAT转换表如下所示。请写出服务器返回给PC1的TCP1的数据分组的源、目的地址，及源、目的端口号，写出PC1收到的数据分组的源、目的地址，及源、目的端口号。

![91b0ddfb72ae3026dc63e96268c65cb8.png][]

路由器上的NAT转换表

<table> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;"> TCP连接 </td> 
 <td colspan="2" style="vertical-align:top;"> WAN端 </td> 
 <td colspan="2" style="vertical-align:top;"> LAN端 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> IP地址 </td> 
 <td style="vertical-align:top;"> 端口号 </td> 
 <td style="vertical-align:top;"> IP地址 </td> 
 <td style="vertical-align:top;"> 端口号 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> TCP1 </td> 
 <td style="vertical-align:top;"> 202.38.75.11 </td> 
 <td style="vertical-align:top;"> 4000 </td> 
 <td style="vertical-align:top;"> 192.168.1.1 </td> 
 <td style="vertical-align:top;"> 3000 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> TCP2 </td> 
 <td style="vertical-align:top;"> 202.38.75.11 </td> 
 <td style="vertical-align:top;"> 4001 </td> 
 <td style="vertical-align:top;"> 192.168.1.1 </td> 
 <td style="vertical-align:top;"> 3001 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> TCP3 </td> 
 <td style="vertical-align:top;"> 202.38.75.11 </td> 
 <td style="vertical-align:top;"> 4002 </td> 
 <td style="vertical-align:top;"> 192.168.1.2 </td> 
 <td style="vertical-align:top;"> 3002 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> TCP4 </td> 
 <td style="vertical-align:top;"> 202.38.75.11 </td> 
 <td style="vertical-align:top;"> 4003 </td> 
 <td style="vertical-align:top;"> 192.168.1.2 </td> 
 <td style="vertical-align:top;"> 3003 </td> 
 </tr> 
 </tbody> 
</table>

（回答时依次写出上述问题的值，用英文分号“;”隔开，结尾无符号，例如：192.168.1.1;192.168.2.2;8000;3000;192.168.1.1;192.168.2.2;8000;3000）

**202.113.16.34;202.38.75.11;80;4000;202.113.16.34;192.168.1.1;80;3000**

### NAT的实现方式 ###

**如果在内部网络中需要搭建一台服务器(服务器只有内部IP地址)，如何让外部的用户访问这台服务器。**

两种方法都可以。  
1.直接用双网卡接公网。  
2.通过路由器上做NAT映射，效果和1一样。

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