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Cisco ASA 5505 Configuration: 6-Steps Basic Tutorial

The Cisco ASA 5505 Firewall is the smallest model in the new 5500 Cisco series of hardware appliances. Although this model is suitable for small businesses, branch offices or even home use, its firewall security capabilities are the same as the biggest models (5510, 5520, 5540 etc). The Adaptive Security technology of the ASA firewalls offers solid and reliable firewall protection, advanced application-aware security, denial of service attack protection and much more. Moreover, the performance of the ASA 5505 appliance supports 150Mbps firewall throughput and 4000 firewall connections per second, which is more than enough for small networks. In this article, I will explain the basic Cisco ASA 5505 configuration for connecting a small network to the Internet (here the complete guides).

We assume that our ISP has assigned us a static public IP address (e.g as an example) and that our internal network range is We will use Port Address Translation (PAT) to translate our internal IP addresses to the public address of the outside interface. The difference of the 5505 model from the bigger ASA models is that it has an 8-port 10/100 switch which acts as Layer 2 only. That is, you can not configure the physical ports as Layer 3 ports, rather you have to create interface VLANs and assign the Layer 2 interfaces in each VLAN. By default, interface Ethernet0/0 is assigned to VLAN 2 and it’s the outside interface (the one which connects to the Internet), and the other 7 interfaces (Ethernet0/1 to 0/7) are assigned by default to VLAN 1 and are used for connecting to the internal network. Let’s see the basic configuration setup of the most important steps that you need to configure.

Cisco ASA 5505 configuration

Let’s now have a look at the Cisco ASA 5505 configuration, in a step by step fashion.

Step1: Configure the internal interface vlan

ASA5505(config)# interface Vlan 1
ASA5505(config-if)# nameif inside
ASA5505(config-if)# security-level 100
ASA5505(config-if)# ip address
ASA5505(config-if)# no shut

Step 2: Configure the external interface vlan (connected to Internet)

ASA5505(config)# interface Vlan 2
ASA5505(config-if)# nameif outside
ASA5505(config-if)# security-level 0
ASA5505(config-if)# ip address
ASA5505(config-if)# no shut

Step 3: Assign Ethernet 0/0 to Vlan 2

ASA5505(config)# interface Ethernet0/0
ASA5505(config-if)# switchport access vlan 2
ASA5505(config-if)# no shut

Step 4: Enable the rest interfaces with no shut

ASA5505(config)# interface Ethernet0/1
ASA5505(config-if)# no shut

Do the same for Ethernet0/1 to 0/7.


Step 5: Configure PAT on the outside interface

ASA5505(config)# global (outside) 1 interface
ASA5505(config)# nat (inside) 1

UPDATE for ASA Version 8.3 and later (including ASA versions 9.x)

From March 2010, Cisco announced the new Cisco ASA software version 8.3. This version introduced several important configuration changes, especially on the NAT/PAT mechanism. The “global” command is no longer supported. NAT (static and dynamic) and PAT are configured under network objects. The PAT configuration below is for ASA 8.3 and later:
object network obj_any
nat (inside,outside) dynamic interface

The above commands will accomplish the same task as the “global” and “nat” commands we had in versions prior to 8.3.


Step 6: Configure default route

Default route towards the ISP (assume default gateway is
ASA5505(config)# route outside 1
The above steps are the absolutely necessary steps you need to configure for making the appliance operational. Of course there are much more configuration details that you need to implement in order to enhance the security and functionality of your appliance, such as Access Control Lists, Static NAT, DHCP, DMZ zones, authentication etc.

You can also learn how to configure any Cisco ASA 5500 Firewall Here and also VPNs.

For more Cisco configuration examples and other related details about designing and implementing Cisco solutions: Cisco Tips and Tutorials.

By Harris Andrea

Cisco ASA 5505 Configuration: 6-Steps Basic Tutorial
4.4 (88.89%)

About Joe

Senior Network Engineer, technology enthusiast, guitar and bass player. Joe Wilson is the creator of RouterFreak.com as well as other niche websites that can be found around on the Internets.

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  1. This is very helpful the last firewall I touch was a pix, I think it was a 5510E, anyways now I have to support an ASA5520 V8.4. I have 2 questions is there a difference in configuring a 5505 and 5520? Also any advice I where I can read/watch online a step by step tutorial that can bring me up to speed on a 5520 ASA?

    Thank you all in advance!!

  2. Practical post , Incidentally , people want a MD PFH Checklist , I encountered a fillable form here https://goo.gl/jdLFpY.

  3. HOT DAMN! Thank you so much for the final piece of the puzzle for the setup: Configure Default Route. I’ve been messing with this for hours now not knowing it was required. Every other tutorial had no mention of this! Thanks again.

  4. Good article. I’ve disconnected my ASA yesterday, as it couldn’t handle my Chromecast (something with UPnP), and i got non-the-wiser from the logs.
    It also cannot tunnel IPv6 through a broker.
    Still a nice apparatus, though.

  5. Can you add to the DMZ configuration. tk’s

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