- CISCO ASA 5505 CONFIGURATION GUIDE STEP BY STEP HOW TO
- CISCO ASA 5505 CONFIGURATION GUIDE STEP BY STEP FULL
We are going to use three of the interfaces in this network – inside (100), dmz1(50) and outside (0). The ASA 5506-X comes with 8 GigE routed interfaces. Internet-host (for testing): 10.1.1.200 Cisco ASA 5506-x Configuration Step 1: Configure ASA interfaces and assign appropriate security levels We assign each network segment a /24 (255.255.255.0) subnet mask. All user and server traffic point to the ASA as their default gateway to the Internet. Network Design and IP Assignmentįor simplicity, we assume the SOHO network has less than 200 users and does not have a layer switch on the LAN. Servers in DMZ1 serve Internet web traffic and internal user traffic from the LAN. All “inbound” access to the LAN is denied unless the connection is initiated from the inside hosts. The design idea here is that we don’t allow any possibilities of compromising the LAN. Any one on the Internet can reach the servers on TCP port 80 for HTTP. However, no inbound access is allowed from any other networks unless explicitly allowed.ĭMZ1 hosts public facing web servers. It not only hosts internal user workstations as well as mission critical production servers. LAN is considered the most secured network. In our example we assign security levels as following: LAN = 100, DMZ1 = 50 and outside = 0. 0 is often placed on the untrusted network such as Internet. The security levels are defined by numeric numbers between 0 and 100. This behavior can also be overridden with an ACL. Also the ASA, by default, will allow traffic from higher to lower security interfaces. This can be overridden by an ACL applied to that lower security interface. It applies to any other business grade firewalls.īy default, traffic passing from a lower to higher security level is denied. Reboot the system to load the new image.īefore jumping into the configuration, I’d like to briefly touch on how Cisco ASAs work in a multi-level security design. Write memory and verify the bootvar is set correctly. ASA1(config)# boot system disk0:/asa952-lfbff-k8.SPAĪSA1(config)# asdm image disk0:/asdm-752.bin All other traffic is denied unless explicitly allowed.ĭownload the recent stable release from and transfer the codes to the ASA.Anyone on the Internet can access the Web Server via a publically NAT’d IP address over HTTP.
CISCO ASA 5505 CONFIGURATION GUIDE STEP BY STEP FULL
CISCO ASA 5505 CONFIGURATION GUIDE STEP BY STEP HOW TO
We will cover how to configure basic ACL (Access Control List), Network Address Translation (NAT) and a simple DMZ network hosting You can download the entire lab setup and configuration files for FREE.Īs part of our documentation effort, we maintain current and accurate information we provided.
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For a more comprehensive, multi-DMZ network configuration example please sees: Cisco ASA 5506-X FirePOWER Module Configuration Example Part 1-4.īelow is the network topology that this example is based on. FirePOWER module configuration is covered in a separate document. In the basic Cisco ASA 5506-x Configuration example, we will cover the fundamentals to setup an ASA firewall for a typical business network.
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The new “X” product line incorporated the industry leading IPS technologies, provides next-generation Intrusion Prevention (NGIPS), Application Visibility and Control (AVC), Advanced Malware Protection (AMP) and URL Filtering. Cisco’s latest additions to their “next-generation” firewall family are the ASA 5506-X, 5508-X, 5516-X and 5585-X with FirePOWER modules.