Chapter 29 Configuring Filtering Services

Filtering URLs and FTP Requests with an External Server

>—Greater than. For example, >tcp/2000.

- —Range. For example, tcp/2000-3000.

–Enter a well-known service name, such as HTTP or FTP.

–Click the ellipses to display the Browse Service dialog box. Choose a service from the drop-down list.

•Choose the action to take when the URL exceeds the specified size from the drop-down list.

•Check the Allow outbound traffic if URL server is not available check box to connect without URL filtering being performed. When this check box is unchecked, you cannot connect to Internet websites if the URL server is unavailable.

•Check the Block users from connecting to an HTTP proxy server check box to prevent HTTP requests made through a proxy server.

•Check the Truncate CGI parameters from URL sent to URL server check box to have the ASA forward only the CGI script location and the script name, without any parameters, to the filtering server.

•Click OK to close this dialog box.

•Click Apply to save your changes.

Step 6 If you chose Add Filter HTTPS Rule, specify the following settings:

•Click one of the following radio buttons: Filter HTTPS or Do not filter HTTPS.

•Enter the source of the traffic to which the filtering action applies. To enter the source, choose from the following options:

–Enter any to indicate any source address.

–Enter a hostname.

–Enter an IP address and optional network mask. You can express the netmask in CIDR or dotted decimal notation. For example, you can enter 10.1.1.0/24 or 10.1.1.0/255.255.255.0.

–Click the ellipses to display the Browse Source dialog box. Choose a host or address from the drop-down list.

•Enter the destination of the traffic to which the filtering action applies. To enter the source, choose from the following options:

–Enter any to indicate any destination address.

–Enter a hostname.

–Enter an IP address and optional network mask. You can express the netmask in CIDR or dotted decimal notation. For example, you can enter 10.1.1.0/24 or 10.1.1.0/255.255.255.0.

–Click the ellipses to display the Browse Destination dialog box. Choose a host or address from the drop-down list.

•Identify the service of the traffic to which the filtering action applies. To identify the service, enter one of the following:

–tcp/port—The port number can range from 1 to 65535. Additionally, you can use the following modifiers with the TCP service:

!=—Not equal to. For example, !=tcp/443 <—Less than. For example, <tcp/2000. >—Greater than. For example, >tcp/2000. - —Range. For example, tcp/2000-3000.

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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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