Chapter 11 Configuring Inspection of Basic Internet Protocols

SMTP and Extended SMTP Inspection

Drop Connections if command line length is greater than 512

Drop Connections if command recipient count is greater than 100

Drop Connections if body line length is greater than 1000

Drop Connections if sender address length is greater than 320

Drop Connections if MIME file name length is greater than 255

–High

Obfuscate Server Banner

Drop Connections if command line length is greater than 512 Drop Connections if command recipient count is greater than 100 Drop Connections if body line length is greater than 1000

Drop Connections and log if sender address length is greater than 320 Drop Connections and log if MIME file name length is greater than 255

–MIME File Type Filtering—Opens the MIME Type Filtering dialog box to configure MIME file type filters.

–Default Level—Sets the security level back to the default level of Low.

•Details—Shows the Parameters and Inspections tabs to configure additional settings.

Add/Edit ESMTP Policy Map (Details)

The Add/Edit ESMTP Policy Map (Details) dialog box is accessible as follows:

Configuration > Global Objects > Inspect Maps > ESMTP > ESMTP Inspect Map > Advanced View

The Add/Edit ESMTP Policy Map pane lets you configure the security level and additional settings for ESMTP application inspection maps.

Fields

•Name—When adding an ESMTP map, enter the name of the ESMTP map. When editing an ESMTP map, the name of the previously configured ESMTP map is shown.

•Description—Enter the description of the ESMTP map, up to 200 characters in length.

•Security Level—Shows the security level and mime file type filtering settings to configure.

•Parameters—Tab that lets you configure the parameters for the ESMTP inspect map.

–Mask server banner—Enforces banner obfuscation.

–Configure Mail Relay—Enables ESMTP mail relay. Domain Name—Specifies a local domain. Action—Drop connection or log.

Log—Enable or disable.

•Inspections—Tab that shows you the ESMTP inspection configuration and lets you add or edit.

–Match Type—Shows the match type, which can be a positive or negative match.

–Criterion—Shows the criterion of the ESMTP inspection.

–Value—Shows the value to match in the ESMTP inspection.

Cisco ASA Series Firewall ASDM Configuration Guide

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Cisco Systems ASA 5505, ASA 5545-X, ASA 5555-X, ASA 5585-X, ASA 5580 manual Add/Edit Esmtp Policy Map Details, 11-56
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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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