WHAT IS FIREWALL?
In the world of computer networks is a term we often hear Firewall. Especially for employees whose company has a computer network to connect computers in each division. Often we as ordinary people do not understand why and to what the firewall itself.Definition / Definition of Firewall
watch the illustration below:
 |
| this how firewall work |
The word firewall wall contains keywords which means the walls. Wall function is to protect everything inside the walls. Well also serves as a firewall, which protects a computer or access the network from another computer that does not have the right to access your computer or network.
So this firewall protects the network and simultaneously protect the computers in the network. Access in question is a remote access from another computer. As we know the operating system like windows and unix network capable of connecting two or more computers to communicate with each other and use network resources such as printers, scanners and other tools including internet connection.
This requires a mechanism or rule to restrict access to a computer to other computers and other network resources. For that we need to install firewall in the network. The most widely used is to install software or a software firewall such as Sygate Firewall, McAfee, BitDefender, or Zone Alarm. Usually antivirus has this facility.
Another way is to use hardware or device that functions as a firewall. Obviously this tool has advantages and a greater ability to limit access to the network than in the form of software. But more expensive when compared with Sygate Firewall which can be downloaded free of charge.Firewall functions
The existence of a firewall is very important in your network, especially if stored in your computer data or a private company that is secret. Surely you do not want anyone else can access this data by exploiting loopholes in the network and your computer.
Firewalls can block connections from the network or specific IP. In addition the filter mechanism also help us in setting up the firewall so it is more flexible in accessing. Visually, the user will be given notification in case of access from the outside or access from the inside out. We can determine if we allow this access.
If we have a control like this then we will be able to find out the entry of data to and from our computer. We can think of like having a security guard who was always checking people coming into our homes and out of our homes. If not interested then we could forbid entry.
The Firewall function in the network are as follows:
1. Packet Filtering: check the headers of TCP / IP packets (depending on network architecture, in this example is TCP IP) and decide whether these data have access to the network.
2. Network Address Translation (NAT): usually a network has a public IP network and in itself has its own IP. Firewall functions to forwarding data packets from the outside network to the IP network is properly fit the local computer.
3. Application Proxy firewall can detect a more specific application protocol specific.
4. Traffic management: record and monitor network traffic
There are still many functions of a firewall as a network and technological developments in software or hardware firewall.How it works Firewall
In simple terms be described the workings of the Firewall
* When there is incoming data packets to the network or computer then the firewall will check the header of the packet data. Then using the network firewall rules can determine whether the data packet can be forwarded or not. If not then there will be blocking, if allowed then this data packet will be forwarded according to the mechanism of the network so getting to the computer in question.
* And conversely when there is packet data outside the firewall can check based on IP and content. Here the network is usually a division can block access to a network resource. Or maybe blocking that contain pornographic content. Here the firewall has a rule to filter such requests.
Cover
Firewalls see the usefulness of such importance in the computer and your network so it is important to install a firewall. The easiest way is to install firewall software on each computer or gateway computer.
But if your company wants a better filtering is needed to run a hardware firewall is more advanced functions. May this information can be useful.
related articles:
No comments:
Post a Comment