Chapter 6 Scenario: DMZ Configuration

Configuring the Security Appliance for a DMZ Deployment

For the internal clients to have access to HTTP and HTTPS resources on the Internet, you must create a rule that translates the real IP addresses of internal clients to an external address that can be used as the source address.

To accomplish this task, you should configure a PAT translation rule (port address translation rule, sometimes called an interface NAT) for the internal interface that translates internal IP addresses to the external IP address of the adaptive security appliance.

In this scenario, the internal address to be translated is that of a subnet of the private network (10.10.10.0). Addresses from this subnet are translated to the public address of the adaptive security appliance (209.165.200.225).

For external clients to have HTTP access to the DMZ web server, you must configure an external identity for the DMZ web server and an access rule that permits HTTP requests coming from clients on the Internet. To accomplish this task, you should configure the following:

Create a static NAT rule. This rule translates the real IP address of the DMZ web server to a single public IP address. In this scenario, the public address of the web server is 209.165.200.226.

Create a security access rule permitting traffic from the Internet if the traffic is an HTTP request destined for the public IP address of the DMZ web server.

Starting ASDM

To run ASDM in a web browser, enter the factory-default IP address in the address field: https://192.168.1.1/admin/.

Note Remember to add the “s” in “https” or the connection fails. HTTPS (HTTP over SSL) provides a secure connection between your browser and the adaptive security appliance.

The Main ASDM window appears.

 

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Cisco Systems ASA 5500 manual Starting Asdm

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.