Chapter 4 Configuring Network Object NAT (ASA 8.3 and Later)

Feature History for Network Object NAT

Table 4-1

Feature History for Network Object NAT (continued)

 

 

 

 

 

 

Platform

 

Feature Name

 

Releases

Feature Information

 

 

 

NAT support for reverse DNS lookups

9.0(1)

NAT now supports translation of the DNS PTR record for

 

 

 

reverse DNS lookups when using IPv4 NAT, IPv6 NAT, and

 

 

 

NAT64 with DNS inspection enabled for the NAT rule.

 

 

 

 

Per-session PAT

 

9.0(1)

The per-session PAT feature improves the scalability of PAT

 

 

 

and, for clustering, allows each member unit to own PAT

 

 

 

connections; multi-session PAT connections have to be

 

 

 

forwarded to and owned by the master unit. At the end of a

 

 

 

per-session PAT session, the ASA sends a reset and

 

 

 

immediately removes the xlate. This reset causes the end

 

 

 

node to immediately release the connection, avoiding the

 

 

 

TIME_WAIT state. Multi-session PAT, on the other hand,

 

 

 

uses the PAT timeout, by default 30 seconds. For

 

 

 

“hit-and-run” traffic, such as HTTP or HTTPS, the

 

 

 

per-session feature can dramatically increase the

 

 

 

connection rate supported by one address. Without the

 

 

 

per-session feature, the maximum connection rate for one

 

 

 

address for an IP protocol is approximately 2000 per

 

 

 

second. With the per-session feature, the connection rate for

 

 

 

one address for an IP protocol is 65535/average-lifetime.

 

 

 

By default, all TCP traffic and UDP DNS traffic use a

 

 

 

per-session PAT xlate. For traffic that requires multi-session

 

 

 

PAT, such as H.323, SIP, or Skinny, you can disable

 

 

 

per-session PAT by creating a per-session deny rule.

 

 

 

We introduced the following screen: Configuration >

 

 

 

Firewall > Advanced > Per-Session NAT Rules.

 

 

 

 

Cisco ASA Series Firewall ASDM Configuration Guide

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Cisco Systems ASA 5585-X, ASA 5505, ASA 5545-X, ASA 5555-X, ASA 5580 manual Platform Feature Name Releases Feature Information
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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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