Basic Configuration Tutorial For the Cisco ASA 5505 Firewall
By Harris Andrea
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 configuration steps needed to setup a Cisco 5505 ASA firewall for connecting a small network to the Internet. We assume that our ISP has assigned us a static public IP address (e.g 200.200.200.1 as an example) and that our internal network range is 192.168.1.0/24. 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.
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 192.168.1.1 255.255.255.0
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 200.200.200.1 255.255.255.0
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 0.0.0.0 0.0.0.0
Step 6: Configure default route towards the ISP (assume default gateway is 200.200.200.2
---------------------------------------------------------------------------------------------------------
ASA5505(config)# route outside 0.0.0.0 0.0.0.0 200.200.200.2 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.
Visit my website in my resource box below for more information about Cisco products and solutions. You can also learn how to configure any Cisco ASA 5500 Firewall Here.
You can check out my website for more Cisco configuration examples and other related details about designing and implementing Cisco solutions: Cisco Tips and Tutorials.
Article Source: http://EzineArticles.com/?expert=Harris_Andrea http://EzineArticles.com/?Basic-Configuration-Tutorial-For-the-Cisco-ASA-5505-Firewall&id=1681858
Routers Articles
Article Keywords:
Routers |
|
A Quick Note
From The Publisher...
If you like the article above, you may be
interested in the following article which is also related to Routers...
|
Finding Your MAC Address On Wired And Wireless Network Cards |
|
The Answer To The Media Access Control Question
Over the past few weeks I have received quite a few e-mails about Ethernet cards, both wired and wireless, and more specifically, about Media Access Control (MAC) addresses. I think the main reason I’ve received so many questions about Ethernet cards and MAC addresses is people trying to secure their home wireless networks and their desire to use MAC address filtering. This type of filtering in wireless networks can be configured to allow or deny specific computers to use or attach to the wireless network, based on the MAC address.
My first thought was to write an article just about MAC addresses and wireless Ethernet. After thinking about it I decided to expand on this and go over some specific information about Ethernet cards and communication.
Different Ways Of Finding Your MAC Address And More
There are several ways of finding your Ethernet and communications protocol information. Many Ethernet card manufacturer’s... |
|
|
|
|

Routers, Computer Networking News |
|
|