Management Properly securing management features/services of any network device is critical to securing not only the host, but also the network in its entirety. The management network, while not shown, should be an out-of-band network.įigure 1-1: Three-Pronged Firewall TopologyĢ. The three-pronged approach is the most common topology used today and is the recommended design when a DMZ is present. Finally, the internal network is the most trusted which would be analogous to an DJHQF\RUJDQL]DWLRQ¶s network which all employees have access. Note that the DMZ may be omitted if there are no external facing services. The DMZ contains services that are accessible via the internal and external networks such as Email or Web Servers. The external network is an untrusted, or less trusted, network (e.g. The topology includes three network segments that each are of a different level of trust: a demilitarized zone (DMZ), external/outside and internal/inside network. Topology The following diagram (Figure 1-1) depicts a common network topology protected by a firewall referred to as the three-pronged firewall and is referenced throughout this document. Suite-B IPSec VPNs (Site to Site and Remote Access) Identity Based Firewall Security High Availability Web Security Protection from botnets Virtual Firewall Transparent (Layer 2) Firewallġ.2. Those features are useful and should be deployed, given an operational requirement and the appropriate environment: x x x x x x x While this guide is intended to help administrators harden the network appliance itself, as well as offers guidance on basic firewall services, the ASA has many other security features that are out of scope of this document. The ASA is designed to stop attacks at the perimeter of a network and offers a rich feature set of capabilities to provide security against an array of network attacks.
CISCO ASDM 5.2 HOW TO SET UP STATIC NAT FOR DMZ SERIES
About Cisco offers a firewall solution to protect networks of all sizes with their ASA 5500 Series NG Firewall. 19 Network/Port Address Translation (NAT/PAT). 16 Internet Control Message Protocol (ICMP). 10 Simple Network Management Protocol (SNMP).
9 Adaptive Security Device Manager (ASDM). 5 Figure 1-1: Three-Pronged Firewall Topology. The topics covered are: secure management, interface configuration, auditing and logging, access control and hardening services provided by the Cisco ASA firewall.Ībstract. It is the responsibility of an organization to develop a security policy that meets all of their specific needs. The guidance provided is based on a basic and simplistic security policy for common network architectures however, the concepts discussed may be applied to complex policies and networks. This document provides security guidance for network administrator to assist in the initial out-of-the-box configuration of Cisco Adaptive Security Appliance (ASA) 5500 Next Generation Firewalls (software version 9.1).
As firewalls increase in complexity, network administrators face a challenge of staying up-to-date on the technology to maintain, and configure, a secure perimeter. The number of applications, protocols, and attacks that a firewall is expected to support and protect against is growing every day. Cisco ASA Configuration Guidance Abstract The modern network perimeter is more complicated than ever.
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