Chapter 11 Configuring Inspection of Basic Internet Protocols

DNS Inspection

map that have the same match, then the order in the configuration determines which match is used, so these buttons are enabled. See the “Guidelines and Limitations” section on page 2-2for more information.

Step 10 Click OK to save the DNS inspect map.

Step 11 Click Apply.

Configuring DNS Inspection

The default ASA configuration includes many default inspections on default ports applied globally on all interfaces. A common method for customizing the inspection configuration is to customize the default global policy. The steps in this section show how to edit the default global policy, but you can alternatively create a new service policy as desired, for example, an interface-specific policy.

Detailed Steps

Step 1 Configure a service policy on the Configuration > Firewall > Service Policy Rules pane according to Chapter 1, “Configuring a Service Policy.”

You can configure DNS inspection as part of a new service policy rule, or you can edit an existing service policy.

Step 2 On the Rule Actions dialog box, click the Protocol Inspections tab.

Step 3 (To change an in-use policy) If you are editing any in-use policy to use a different DNS inspection policy map, you must disable the DNS inspection, and then re-enable it with the new DNS inspection policy map name:

a.Uncheck the DNS check box.

b.Click OK.

c.Click Apply.

d.Repeat these steps to return to the Protocol Inspections tab.

Step 4 Check the DNS check box.

Step 5 Click Configure.

The Select DNS Inspect Map dialog appears.

Step 6 Choose the inspection map:

•To use the default map, click Use the default DNS inspection map (preset_dns_map).

•To use a DNS inspection policy map that you configured in the “(Optional) Configuring a DNS Inspection Policy Map and Class Map” section on page 11-3, select the map name.

•To add a new map, click Add. See the “(Optional) Configuring a DNS Inspection Policy Map and Class Map” section on page 11-3for more information.

Step 7 If you use the Botnet Traffic Filter, click Enable Botnet traffic filter DNS snooping. Botnet Traffic Filter snooping compares the domain name with those on the dynamic database or static database, and adds the name and IP address to the Botnet Traffic Filter DNS reverse lookup cache. This cache is then used by the Botnet Traffic Filter when connections are made to the suspicious address. We suggest that you enable DNS snooping only on interfaces where external DNS requests are going. Enabling DNS snooping on all UDP DNS traffic, including that going to an internal DNS server, creates unnecessary

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ASA Services Module, ASA 5555-X, ASA 5545-X, ASA 5585-X, ASA 5580 specifications

Cisco Systems has long been a leader in the field of network security, and its Adaptive Security Appliance (ASA) series is a testament to this expertise. Within the ASA lineup, models such as the ASA 5505, ASA 5580, ASA 5585-X, ASA 5545-X, and ASA 5555-X stand out for their unique features, capabilities, and technological advancements.

The Cisco ASA 5505 is designed for small businesses or branch offices. It provides essential security features such as firewall protection, flexible VPN capabilities, and intrusion prevention. The ASA 5505 supports a user-friendly interface, allowing for straightforward management. Its built-in threat detection and prevention tools provide a layered defense, and with scalability in mind, it can accommodate various expansion options as organizational needs grow.

Moving up the line, the ASA 5580 delivers greater throughput and advanced security features. This model is suited for medium to large enterprises that require robust protection against increasingly sophisticated threats. Its multi-core architecture allows it to manage high volumes of traffic seamlessly while maintaining excellent performance levels. The ASA 5580 also supports application-layer security and customizable access policies, making it highly adaptable to diverse security environments.

The ASA 5585-X further enhances Cisco's security offerings with advanced malware protection and extensive security intelligence capabilities. It incorporates next-generation firewall features, including context-aware security, and supports advanced threat detection technologies. This model is ideal for large enterprises or data centers that prioritize security while ensuring uninterrupted network performance and availability.

For enterprises requiring a balance of performance and security, the ASA 5545-X presents a compelling option. This model features scalable performance metrics, high availability, and integrated advanced threat protection. Coupled with advanced endpoint protection and detailed monitoring capabilities, the ASA 5545-X enables organizations to manage their security posture effectively.

Lastly, the ASA 5555-X blends cutting-edge technologies with strong security infrastructures. It boasts high throughput and the ability to execute deep packet inspections. Its sophisticated architecture supports threat intelligence feeds that provide real-time security updates, making it a powerful tool against modern threats.

Each of these Cisco ASA models brings specific advantages to varied environments. Their integrative capabilities enable businesses to enhance their security postures while benefiting from seamless scalability and management. As cybersecurity threats evolve, these advanced appliances play a vital role in protecting valuable digital assets.
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