Network address translation is a method to connect more than one computer to the Internet network by using a single IP address. Much use of this method due to the limited availability of IP addresses, the need for safety (security), and the ease and flexibility in network administration.
IP addresses
Currently, the widely used IP protocol is IP version 4 (IPv4). With a length of 4-byte address means that there are 2 to the power 32 = 4,294,967,296 available IP addresses. This amount is theoretically the number of computers that can directly connect to the internet. Because of this limitation of most ISPs (Internet Service Provider) will only allocate one address for one user and this address is dynamic, in the sense of a given IP address will be different each time a user to connect to the internet. This will make it difficult for businesses to lower middle class. On the one hand they need more computers are connected to the internet, but on the other hand only one available IP address, which means there is only one computer that can connect to the internet. This can be overcome with the NAT method. With a NAT gateway that runs on one computer, one IP address can be divided into several other computers and they can connect to the internet simultaneously
.Currently, the widely used IP protocol is IP version 4 (IPv4). With a length of 4-byte address means that there are 2 to the power 32 = 4,294,967,296 available IP addresses. This amount is theoretically the number of computers that can directly connect to the internet. Because of this limitation of most ISPs (Internet Service Provider) will only allocate one address for one user and this address is dynamic, in the sense of a given IP address will be different each time a user to connect to the internet. This will make it difficult for businesses to lower middle class. On the one hand they need more computers are connected to the internet, but on the other hand only one available IP address, which means there is only one computer that can connect to the internet. This can be overcome with the NAT method. With a NAT gateway that runs on one computer, one IP address can be divided into several other computers and they can connect to the internet simultaneously
Security
When a computer connected to the internet, the computer can not only access, for example to the server a particular site, but the computer is also very likely to be accessed by other computers are also connected to the internet. If misused, it can be very dangerous. Important data can be viewed or even stolen by people who are irresponsible. NAT will automatically give protection as well as a firewall to only allow connections from the network. This means that a network security level will increase, because of possible connections from outside to inside the network to be relatively very small.Network Administration
With NAT, a large network can be broken down into smaller networks. Small parts that each have a single IP address, so we can add or reduce the number of computers without affecting the overall network. In addition, the modern NAT gateway DHCP server exists that can automatically configure the client computer. This is very advantageous for network admins because to change the network configuration, the admin just need to change on a computer server and these changes will happen on all client computers. Besides the NAT gateway is able to limit access to the internet, is also able to record all traffic, and from the Internet. Overall, with all the advantages that the NAT gateway, network admin would be very helpful in performing his duties.
With NAT, a large network can be broken down into smaller networks. Small parts that each have a single IP address, so we can add or reduce the number of computers without affecting the overall network. In addition, the modern NAT gateway DHCP server exists that can automatically configure the client computer. This is very advantageous for network admins because to change the network configuration, the admin just need to change on a computer server and these changes will happen on all client computers. Besides the NAT gateway is able to limit access to the internet, is also able to record all traffic, and from the Internet. Overall, with all the advantages that the NAT gateway, network admin would be very helpful in performing his duties.
types of NAT :
1.full cone NAT
2.Restricted cone NAT
3.Port restricted cone NAT
4.Symmetric NAT
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