Casio ISA550WBUN3K9 manual Example DMZ with One Public IP Address for WAN and DMZ

Networking	4
Configuring DMZ

Figure 1 Example DMZ with One Public IP Address for WAN and DMZ

www.example.com

Internet
	Source Address Translation
Public IP Address	209.165.200.225	172.16.2.30
209.165.200.225
	DMZ Interface
ISA500	172.16.2.1
LAN Interface	Web Server
	Private IP Address: 172.16.2.30
192.168.75.1
	Public IP Address: 209.165.200.225

User	User
192.168.75.10	192.168.75.11

283049

In this scenario, the business has one public IP address, 209.165.200.225, which is used for both the security appliance’s public IP address and the web server’s public IP address. The administrator configures the configurable port to be used as a DMZ port. A firewall rule allows inbound HTTP traffic to the web server at

172.16.2.30.Internet users enter the domain name that is associated with the IP address 209.165.200.225 and can then connect to the web server. The same IP address is used for the WAN interface.

Cisco ISA500 Series Integrated Security Appliances Administration Guide 142