[Router] acl number 2000 //配置允许进行NAT转换的内网地址段
[Router-acl-basic-2000] rule 5 permit source 192.168.88.0 0.0.0.255 
[Router-acl-basic-2000] quit 

[Router] nat alg dns enable //使能DNS协议的NAT ALG功能 
[Router] quit 

[Router]nat dns-map www.testnat.com 106.3.45.2 80 tcp //配置DNS的DNS Mapping 
[Router] quit 

[Router] interface GigabitEthernet 0/0/2 
[Router-GigabitEthernet 0/0/2]undo portswhich 
[Router-GigabitEthernet 0/0/2] ip address 192.168.88.1 255.255.255.0 
[Router] quit 

[Router] interface GigabitEthernet 0/0/3 
[Router-GigabitEthernet 0/0/3] ip address 106.3.45.2 255.255.255.0 
[Router-GigabitEthernet 0/0/3]nat server protocol tcp global 106.3.45.2 www inside 192.168.88.100 8080 //配置NAT Server 
[Router-GigabitEthernet 0/0/3]nat outbound 2000 
# 
[Router]ip route-static 0.0.0.0 0.0.0.0 106.3.45.1 //配置缺省路由，指定下一跳地址为106.3.45.1