静态、动态NAT和PAT

精选转载

hankaixiaoyue 2010-08-07 00:40:14

环境：两台路由器，由串口相联。

要求：如下图所示，设置R1以太口的secondary地址为10.1.1.2-10.1.1.4,将10.1.1.2和10.1.1.3这两个辅助地址做动态NAT转换,地址池范围:80.1.1.2-80.1.1.9；将辅助地址10.1.1.4静态转换成80.1.1.10，将以太口的主IP地址作PAT转换。

步骤一、基本配置

R1的配置：
R1(config)#interface e0
R1(config-if)#ip address 10.1.1.1 255.255.255.0
R1(config-if)#ip address 10.1.1.2 255.255.255.0 secondary 设置辅助IP
R1(config-if)#ip address 10.1.1.3 255.255.255.0 secondary
R1(config-if)#ip address 10.1.1.4 255.255.255.0 secondary
R1(config-if)#no keepalive 关闭检测
R1(config-if)#no shutdown
R1(config-if)#interface s0
R1(config-if)#ip address 30.1.1.1 255.255.255.0
R1(config-if)#clock rate 64000
R1(config-if)#no shutdown

R2的配置：
R2(config)#interface loopback 0
R2(config-if)#ip address 20.1.1.1 255.255.255.0
R2(config-if)#interface s1
R2(config-if)#ip address 30.1.1.2 255.255.255.0
R2(config-if)#no shutdown

配置路由：
R2(config)#ip route 80.1.1.0 255.255.255.240 serial 1
R1(config)#ip route 0.0.0.0 0.0.0.0 serial 0

步骤二、NAT与PAT的创建

NAT的配置:
R1(config)#access-list 10 permit host 10.1.1.2 定义转换列表
R1(config)#access-list 10 permit host 10.1.1.3
R1(config)#ip nat pool ippool 80.1.1.2 80.1.1.9 prefix-length 28 定义地址池
R1(config)#ip nat inside source list 10 pool ippool 将池和列表关联

PAT的配置：
R1(config)#access-list 11 permit host 10.1.1.1 PAT转换列表
R1(config)#ip nat inside source list 11 interface serial 0 overload 与接口映射

静态NAT的配置：
R1(config)#ip nat inside source static 10.1.1.4 80.1.1.10

R1(config)#interface e0
R1(config-if)#ip nat inside 加载到接口
R1(config-if)#interface s0
R1(config-if)#ip nat outside 加载到接口

步骤三、测试
R1#ping
Protocol [ip]:
Target IP address:20.1.1.1
Extended commands [n]: y
Source address or interface: 10.1.1.1
!!!!!

R1#ping
Protocol [ip]:
Target IP address: 20.1.1.1
Extended commands [n]: y
Source address or interface: 10.1.1.2
!!!!!

R1#ping
Protocol [ip]:
Target IP address:20.1.1.1
Extended commands [n]: y
Source address or interface: 10.1.1.3
!!!!!

R1#show ip nat translation 查看转换列表
Pro Inside global Inside local Outside local Outside global
--- 80.1.1.10 10.1.1.4 --- ---
--- 80.1.1.2 10.1.1.2 --- ---
--- 80.1.1.3 10.1.1.3 --- ---
icmp 30.1.1.1:2832 10.1.1.1:2832 20.1.1.1:2832 20.1.1.1:2832
icmp 30.1.1.1:2833 10.1.1.1:2833 20.1.1.1:2833 20.1.1.1:2833
icmp 30.1.1.1:2834 10.1.1.1:2834 20.1.1.1:2834 20.1.1.1:2834
icmp 30.1.1.1:2835 10.1.1.1:2835 20.1.1.1:2835 20.1.1.1:2835
icmp 30.1.1.1:2836 10.1.1.1:2836 20.1.1.1:2836 20.1.1.1:2836

步骤四、显示当前配置

R1的当前配置：
R1#show running-config
hostname R1
!
no ip domain-lookup
!
interface Ethernet0
ip address 10.1.1.2 255.255.255.0 secondary
ip address 10.1.1.3 255.255.255.0 secondary
ip address 10.1.1.4 255.255.255.0 secondary
ip address 10.1.1.1 255.255.255.0
ip nat inside
no keepalive
!
interface Serial0
ip address 30.1.1.1 255.255.255.0
ip nat outside
clockrate 64000
!
ip nat pool ippool 80.1.1.2 80.1.1.9 prefix-length 28
ip nat inside source list 10 pool ippool
ip nat inside source list 11 interface Serial0 overload
ip nat inside source static 10.1.1.4 80.1.1.10
ip route 0.0.0.0 0.0.0.0 Serial0
!
access-list 10 permit 10.1.1.2
access-list 10 permit 10.1.1.3
access-list 11 permit 10.1.1.1
!
line con 0
exec-timeout 0 0
logging synchronous

end

R2的当前配置：
r2#show running-config
hostname r2

no ip domain-lookup
!
interface Loopback0
ip address 20.1.1.1 255.255.255.0
!
interface Serial1
ip address 30.1.1.2 255.255.255.0
!
ip route 80.1.1.0 255.255.255.240 Serial1
line con 0
exec-timeout 0 0
logging