NAT实战——设置动态NAT

动态NAT

拓扑图如下：

实验步骤

1、设置三层交换机sw

sw#conf t Enter configuration commands, one per line.  End with CNTL/Z.sw(config)#no ip routing sw(config)#

2、设置路由R1

R1#conf t Enter configuration commands, one per line.  End with CNTL/Z.R1(config)#int f 0/1R1(config-if)#ip add 192.168.20.1 255.255.255.0         //仅设置IP地址与子网掩码R1(config-if)#no shut *Mar  1 00:00:54.063: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up*Mar  1 00:00:55.063: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to upR1(config-if)#int f 0/0R1(config-if)#ip add 192.168.100.1 255.255.255.0          //仅设置IP地址与子网掩码R1(config-if)#no shut R1(config-if)#ex *Mar  1 00:01:08.423: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up*Mar  1 00:01:09.423: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to upR1(config)#

3、对三台PC机进行设置

PC1

PC1> PC1> ip 192.168.20.20 192.168.20.1Checking for duplicate address...PC1 : 192.168.20.20 255.255.255.0 gateway 192.168.20.1PC1>

PC2

PC2> PC2> ip 192.168.20.30 192.168.20.1 Checking for duplicate address...PC1 : 192.168.20.30 255.255.255.0 gateway 192.168.20.1PC2> 

PC3

PC3> PC3> ip 192.168.100.10 192.168.100.1Checking for duplicate address...PC1 : 192.168.100.10 255.255.255.0 gateway 192.168.100.1PC3>

注意：此时理论上是已经可以做到全网互通的，具体见下图。如果无法连接请自行检查命令。

为满足实验要求，下面将正式进行动态NAT的设置。

R1

R1(config)#R1(config)#ip access-list standard zhy                          //设置命名访问控制列表R1(config-std-nacl)#permit 192.168.20.0 0.0.0.255 R1(config)#ip nat pool test 12.0.0.10 12.0.0.20 netmask 255.255.255.0        //设置公网地址池R1(config)#*Mar  1 00:09:46.123: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to upR1(config)#ip nat inside source list zhy pool test                  //实现网络地址转换R1(config)#int f 0/1R1(config-if)#ip nat inside                          //启用内部NATR1(config-if)#int f 0/0R1(config-if)#ip nat outside                         //启用外部NATR1(config-if)#ex 

验证结果

以上就是动态NAT的地址转换，不需要手动进行指定，他自动转换的都是区间范围内的地址