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Hello everybody,

now in hosting blogs NAT is trend.Any one know about this very clearly.

please post or share your knowledge with us.

Thanks.

Network address translation (NAT) is a method of remapping one IP address space into another by modifying network address information in Internet Protocol (IP) datagram packet headers while they are in transit across a traffic routing device.

How NAT works
When computers and servers within a network communicate, they need to be identified to each other by a unique address, To avoid this problem, a temporary solution was produced known as NAT.

NAT have two types of IP addresses, public and private. A range of private addresses were introduced, which anyone could use, as long as these were kept private within the network and not routed on the internet.

Types of NAT

Three types of NAT rules are used;

Static NAT

A pool of public IP addresses is allocated to the NAT device. A private IP address can then be statically mapped to anyone of these public addresses. This type of NATTING scheme is usually used for servers requiring the same IP address always, hence the name "static", so first server will always have the same IP address allotted to it, and second server will have a different public IP address allotted to it and so on.

Dynamic NAT

Again the NAT device will carry a pool of IP addresses. now although the pool of IP addresses will be used when needed and then given back to the pool. Hence the name is "dynamic".

Port Address Translation (PAT)

In this kind of setup, one public IP address assigned to their network, and so everyone would share this one public address when using the internet, browsing the web. The connections are uniquely identified by a source port, all using the same public IP but with unique source ports to identify who requested what information.
We would save a reasonable amount of money and IP addresses using this method because it is only using one IP address. This has been a key factor to why IPv6 has been stated for some years.

Disadvantages of NAT

Some applications and services such as VPN and video conferencing are very difficult to process via NAT.

Network Address Translation (NAT) is a technology that is generally used for IP translation and mapping. It allows sharing internet access to home networks. NAT implements the accessibility by using a device or software which allows the complete home network to share internet access.

When a request is sent from a private network to the public network, a little conduit will be opened by the NAT device between the home computer and the destination computer. The response sent by public network system will be sent back to the client through NAT.