Chapter 3 Information About NAT (ASA 8.3 and Later)

NAT for VPN

object network vpn_local

subnet 10.3.3.0 255.255.255.0

nat (outside,outside) dynamic interface

! Identify inside Boulder network, & perform object interface PAT when going to Internet:

object network boulder_inside

subnet 10.1.1.0 255.255.255.0

nat (inside,outside) dynamic interface

!Identify inside San Jose network for use in twice NAT rule: object network sanjose_inside

subnet 10.2.2.0 255.255.255.0

!Use twice NAT to pass traffic between the Boulder network and the VPN client without

!address translation (identity NAT):

nat (inside,outside) source static boulder_inside boulder_inside destination static vpn_local vpn_local

!Use twice NAT to pass traffic between the Boulder network and San Jose without

!address translation (identity NAT):

nat (inside,outside) source static boulder_inside boulder_inside destination static

sanjose_inside sanjose_inside

!Use twice NAT to pass traffic between the VPN client and San Jose without

!address translation (identity NAT):

nat (outside,outside) source static vpn_local vpn_local destination static sanjose_inside sanjose_inside

See the following sample NAT configuration for ASA2 (San Jose):

! Identify inside San Jose network, & perform object interface PAT when going to Internet:

object network sanjose_inside subnet 10.2.2.0 255.255.255.0

nat (inside,outside) dynamic interface

! Identify inside Boulder network for use in twice NAT rule:

object network boulder_inside

subnet 10.1.1.0 255.255.255.0

! Identify local VPN network for use in twice NAT rule:

object network vpn_local

subnet 10.3.3.0 255.255.255.0

!Use twice NAT to pass traffic between the San Jose network and Boulder without

!address translation (identity NAT):

nat (inside,outside) source static sanjose_inside sanjose_inside destination static

boulder_inside boulder_inside

!Use twice NAT to pass traffic between the San Jose network and the VPN client without

!address translation (identity NAT):

nat (inside,outside) source static sanjose_inside sanjose_inside destination static

vpn_local vpn_local

NAT and VPN Management Access

When using VPN, you can allow management access to an interface other than the one from which you entered the ASA ( “Configuring Management Access Over a VPN Tunnel” section on page 45-10). For example, if you enter the ASA from the outside interface, the management-access feature lets you connect to the inside interface using ASDM, SSH, Telnet, or SNMP; or you can ping the inside interface.

Cisco ASA Series Firewall ASDM Configuration Guide

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Cisco Systems ASA 5545-X, ASA 5505, ASA 5555-X, ASA 5585-X, ASA 5580 manual NAT and VPN Management Access, Subnet 10.2.2.0
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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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