Chapter 11 Configuring Inspection of Basic Internet Protocols

SMTP and Extended SMTP Inspection

–Action—Shows the action if the match condition is met.

–Log—Shows the log state.

–Add—Opens the Add ESMTP Inspect dialog box to add an ESMTP inspection.

–Edit—Opens the Edit ESMTP Inspect dialog box to edit an ESMTP inspection.

–Delete—Deletes an ESMTP inspection.

–Move Up—Moves an inspection up in the list.

–Move Down—Moves an inspection down in the list.

Add/Edit ESMTP Inspect

The Add/Edit ESMTP Inspect dialog box is accessible as follows:

Configuration > Global Objects > Inspect Maps > ESMTP > ESMTP Inspect Map > Advanced View > Add/Edit ESMTP Inspect

The Add/Edit ESMTP Inspect dialog box lets you define the match criterion and value for the ESMTP inspect map.

Fields

•Match Type—Specifies whether traffic should match or not match the values.

For example, if No Match is selected on the string “example.com,” then any traffic that contains “example.com” is excluded from the class map.

•Criterion—Specifies which criterion of ESMTP traffic to match.

–Body Length—Match body length at specified length in bytes.

–Body Line Length—Match body line length matching at specified length in bytes.

–Commands—Match commands exchanged in the ESMTP protocol.

–Command Recipient Count—Match command recipient count greater than number specified.

–Command Line Length—Match command line length greater than length specified in bytes.

–EHLO Reply Parameters—Match an ESMTP ehlo reply parameter.

–Header Length—Match header length at length specified in bytes.

–Header To Fields Count—Match header To fields count greater than number specified.

–Invalid Recipients Count—Match invalid recipients count greater than number specified.

–MIME File Type—Match MIME file type.

–MIME Filename Length—Match MIME filename.

–MIME Encoding—Match MIME encoding.

–Sender Address—Match sender email address.

–Sender Address Length—Match sender email address length.

•Body Length Criterion Values—Specifies the value details for body length match.

–Greater Than Length—Body length in bytes.

–Action—Reset, drop connection, log.

–Log—Enable or disable.

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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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