Chapter 6 Scenario: DMZ Configuration

Configuring the Security Appliance for a DMZ Deployment

For many configurations, you would also need to create a NAT rule between the inside interface and the outside interface to enable inside clients to communicate with the Internet.

However, in this scenario you do not need to create this rule explicitly. The reason is that the IP pool (pool ID 200) contains both types of addresses needed for address translation: the range of IP addresses to be used by the DMZ interface, and the IP address to be used for the outside interface. This enables ASDM to create the second translation rule for you.

Configuring an External Identity for the DMZ Web Server

The DMZ web server needs to be accessible by all hosts on the Internet. This configuration requires translating the private IP address of the DMZ web server to a public IP address, enabling access to outside HTTP clients that are unaware of the adaptive security appliance. To map the real web server IP address (10.30.30.30) statically to a public IP address (209.165.200.226), perform the following steps:

Step 1 In the ASDM window, click the Configuration tool.

Step 2 In the Features pane, click NAT.

Step 3 From the Add drop-down list, choose Add Static NAT Rule. The Add Static NAT Rule dialog box appears.

Step 4 In the Real Address area, specify the real IP address of the web server:

a.From the Interface drop-down list, choose the DMZ interface.

b.Enter the real IP address of the DMZ web server. In this scenario, the IP address is 10.30.30.30.

c.From the Netmask drop-down list, choose the Netmask 255.255.255.255.

 

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Cisco Systems ASA 5500 manual Configuring an External Identity for the DMZ Web Server

ASA 5500 specifications

Cisco Systems ASA 5500 is a robust security appliance designed to provide advanced network security and protection against both internal and external threats. Ideal for organizations of various sizes, the ASA 5500 series offers a wide range of features that combine firewall capabilities with intrusion prevention, VPN support, and application control, among others.

One of the key features of the ASA 5500 is its stateful firewall technology. This allows the device to monitor active connections and enforce security policies based on the state of the traffic. By maintaining the context of network sessions, the firewall can make informed decisions on whether to allow or deny traffic based on established rules.

In addition to traditional firewall functionalities, the ASA 5500 series integrates advanced intrusion prevention capabilities. By analyzing traffic patterns and identifying known threats, the IPS functionality helps organizations defend against a variety of malicious activities, such as DDoS attacks, malware, and unauthorized access attempts. The ASA 5500 continuously updates its threat intelligence through Cisco's global threat database, enhancing its ability to detect emerging threats in real-time.

Virtual Private Network (VPN) support is another significant aspect of the ASA 5500 series. The device offers secure, encrypted connections for remote users and branch offices, ensuring safe access to corporate resources over the Internet. It supports both IPsec and SSL VPN protocols, allowing organizations to choose the best option for their specific needs. This capability is crucial for businesses that require a secure environment for remote work.

The ASA 5500 series also features extensive application control and visibility tools. These tools enable organizations to manage and control the applications running on their network, ensuring that only authorized applications can communicate through the firewall. This level of control helps to mitigate risks associated with unauthorized applications, which can lead to data breaches or reduced productivity.

Moreover, the ASA 5500 is designed with high availability and scalability in mind. Its clustering support ensures that multiple units can work together to provide redundancy and load balancing, enhancing both performance and reliability. This characteristic is especially important for organizations looking to maintain continuous operation during traffic spikes or hardware failures.

In summary, Cisco Systems ASA 5500 is an all-in-one security solution that combines stateful firewall protection, intrusion prevention, VPN capabilities, and application control. With its robust feature set and focus on security, it is well-suited for organizations seeking to protect their networks from an ever-evolving landscape of cyber threats. Whether for small businesses or large enterprises, the ASA 5500 provides the necessary tools to create a secure networking environment.