[Router] acl number 2000 //配置允許進行NAT轉換的內網地址段
[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協議的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，指定下一跳地址為106.3.45.1 ，香港服務器租用，國內服務器租用
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