Cisco Systems and the ASA Services Module, ASA 5505, ASA 5545-X

Chapter 7 Configuring AAA Rules for Network Access

Configuring Authentication for Network Access

Command	Purpose

virtual telnet ip_address	Configures a virtual Telnet server.
	The ip_address argument sets the IP address for the virtual
Example:	Telnet server. Make sure this address is an unused address that
ciscoasa(config)# virtual telnet 209.165.202.129	is routed to the ASA.
	You must configure authentication for Telnet access to the
	virtual Telnet address as well as the other services that you
	want to authenticate using the authentication match or aaa
	authentication include command.
	When an unauthenticated user connects to the virtual Telnet IP
	address, the user is challenged for a username and password,
	and then authenticated by the AAA server. Once
	authenticated, the user sees the message “Authentication
	Successful.” Then, the user can successfully access other
	services that require authentication.
	For inbound users (from lower security to higher security),
	you must also include the virtual Telnet address as a
	destination interface in the ACL applied to the source
	interface. In addition, you must add a static NAT command for
	the virtual Telnet IP address, even if NAT is not required. An
	identity NAT command is typically used (where you translate
	the address to itself).
	For outbound users, there is an explicit permit for traffic, but
	if you apply an ACL to an inside interface, be sure to allow
	access to the virtual Telnet address. A static statement is not
	required.
	To log out from the ASA, reconnect to the virtual Telnet IP
	address; you are then prompted to log out.

Examples

The following example shows how to enable virtual Telnet together with AAA authentication for other services:

ciscoasa(config)# virtual telnet 209.165.202.129

ciscoasa(config)# access-list ACL-IN extended permit tcp any host 209.165.200.225 eq smtp ciscoasa(config)# access-list ACL-IN remark This is the SMTP server on the inside ciscoasa(config)# access-list ACL-IN extended permit tcp any host 209.165.202.129 eq telnet

ciscoasa(config)# access-list ACL-IN remark This is the virtual Telnet address ciscoasa(config)# access-group ACL-IN in interface outside ciscoasa(config)# network object obj-209.165.202.129-01 ciscoasa(config-network-object)#host 209.165.202.129 ciscoasa(config-network-object)#nat (inside,outside) static 209.165.202.129 ciscoasa(config)# access-list AUTH extended permit tcp any host 209.165.200.225 eq smtp ciscoasa(config)# access-list AUTH remark This is the SMTP server on the inside ciscoasa(config)# access-list AUTH extended permit tcp any host 209.165.202.129 eq telnet ciscoasa(config)# access-list AUTH remark This is the virtual Telnet address ciscoasa(config)# aaa authentication match AUTH outside tacacs+

Cisco ASA Series Firewall CLI Configuration Guide

7-13

ASA 5555-X, and the ASA Services Module, 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 and the ASA Services Module, ASA 5505, ASA 5545-X Authentication include command

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

Command

Example:

authentication include command.

Examples

ASA 5555-X, and the ASA Services Module, ASA 5545-X, ASA 5585-X, ASA 5580 specifications