Cisco Systems ASA 5505, ASA 5545-X, ASA 5555-X, ASA 5585-X, ASA 5580

Chapter 3 Information About NAT (ASA 8.3 and Later)

NAT for VPN

Figure 3-23 Interface PAT and Identity NAT for Site-to-Site VPN

2.Identity NAT between NWs connected by VPN

	Src: 10.1.1.6		10.1.1.6
1. IM to 10.2.2.78	Dst: 10.2.2.78		10.2.2.78		3. IM received
1. IM to 10.2.2.78					3. IM received
Src: 10.1.1.6					Src: 10.1.1.6
	ASA Outside IP: 203.0.113.1
Inside			Internet		Inside
Inside					Inside
Boulder		Site-to-Site VPN Tunnel			San Jose
Boulder	ASA1	Site-to-Site VPN Tunnel		ASA2	10.2.2.78
10.1.1.6	ASA1			ASA2	10.2.2.78

Src: 10.1.1.6

A. HTTP to www.example.com

10.1.1.6 203.0.113.1:6070

B. ASA performs interface PAT for outgoing traffic.

www.example.com

Src: 203.0.113.1:6070

C. HTTP request to www.example.com

303459

Figure 3-24shows a VPN client connected to ASA1 (Boulder), with a Telnet request for a server (10.2.2.78) accessible over a site-to-site tunnel between ASA1 and ASA2 (San Jose). Because this is a hairpin connection, you need to enable intra-interface communication, which is also required for non-split-tunneled Internet-bound traffic from the VPN client. You also need to configure identity NAT between the VPN client and the Boulder & San Jose networks, just as you would between any networks connected by VPN to exempt this traffic from outbound NAT rules.

Figure 3-24 VPN Client Access to Site-to-Site VPN

2.ASA decrypts packet; src address is now local address

209.165.201.10 10.3.3.10

1.HTTP request to 10.2.2.78

Src: 209.165.201.10

VPN Client

209.165.201.10

		Internet
	Inside			Inside
	Inside			San Jose
	Boulder	Site-to-Site VPN Tunnel		San Jose
10.1.1.6	ASA1	Site-to-Site VPN Tunnel	ASA2	10.2.2.78
10.1.1.6	ASA1		ASA2	10.2.2.78
	Src: 10.3.3.10	10.3.3.10
	Dst: 10.2.2.78	10.2.2.78		Src: 10.3.3.10

	3. Identity NAT between VPN Client &	4. HTTP request received
	San Jose NWs; intra-interface config req’d	4. HTTP request received
	San Jose NWs; intra-interface config req’d

303460

See the following sample NAT configuration for ASA1 (Boulder):

! Enable hairpin for VPN client traffic:

same-security-traffic permit intra-interface

! Identify local VPN network, & perform object interface PAT when going to Internet:

Cisco ASA Series Firewall ASDM Configuration Guide

3-28

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.

Cisco Systems ASA 5505, ASA 5545-X See the following sample NAT configuration for ASA1 Boulder

Models: ASA Services Module ASA 5555-X ASA 5545-X ASA 5585-X ASA 5580 ASA 5505