Chapter 5 Configuring Twice NAT (ASA 8.3 and Later)

Feature History for Twice NAT

Table 5-1

Feature History for Twice NAT (continued)

 

 

 

 

 

 

 

Platform

 

Feature Name

 

Releases

Feature Information

 

 

 

Automatic NAT rules to translate a VPN peer’s

8.4(3)

In rare situations, you might want to use a VPN peer’s real

local IP address back to the peer’s real IP

 

IP address on the inside network instead of an assigned local

address

 

 

IP address. Normally with VPN, the peer is given an

 

 

 

assigned local IP address to access the inside network.

 

 

 

However, you might want to translate the local IP address

 

 

 

back to the peer’s real public IP address if, for example,

 

 

 

your inside servers and network security is based on the

 

 

 

peer’s real IP address.

 

 

 

You can enable this feature on one interface per tunnel

 

 

 

group. Object NAT rules are dynamically added and deleted

 

 

 

when the VPN session is established or disconnected. You

 

 

 

can view the rules using the show nat command.

 

 

 

Note Because of routing issues, we do not recommend

 

 

 

using this feature unless you know you need this

 

 

 

feature; contact Cisco TAC to confirm feature

 

 

 

compatibility with your network. See the following

 

 

 

limitations:

 

 

 

• Only supports Cisco IPsec and AnyConnect Client.

 

 

 

• Return traffic to the public IP addresses must be

 

 

 

routed back to the ASA so the NAT policy and VPN

 

 

 

policy can be applied.

 

 

 

• Does not support load-balancing (because of

 

 

 

routing issues).

 

 

 

• Does not support roaming (public IP changing).

 

 

 

ASDM does not support this command; enter the command

 

 

 

using the Command Line Tool.

 

 

 

NAT support for IPv6

9.0(1)

NAT now supports IPv6 traffic, as well as translating

 

 

 

between IPv4 and IPv6. Translating between IPv4 and IPv6

 

 

 

is not supported in transparent mode.

 

 

 

We modified the following screen: Configuration > Firewall

 

 

 

> NAT Rules.

 

 

 

 

Cisco ASA Series Firewall ASDM Configuration Guide

5-50

Page 185 Page 187
Page 186
Image 186
Cisco Systems ASA 5505, ASA 5545-X, ASA 5555-X, ASA 5585-X, ASA 5580 manual Platform Feature Name Releases Feature Information
Page 185 Page 187

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.
Top Page Image Contents