What is network address translation-nat


Added: 16-11-2004
Author: Pambos Charalambous
Category: Wide-Band Internet 		← Back | ↓ Related | Home →


According to the IETF documents RFC 1631, more than two difficult problems facing the Internet IP address of IP and decrease scaling in routing. As we know, the IP address in IPv4 is 32-bit version, which gives the total number of IP addresses 2 ^ 32 or approximately 4 billion. However, with the rapid development of Internet and IP nodes increase in electricity, reducing the IP address of the Internet is a threat Community.

IETF (Internet Engineering Task Force) and international agencies have taken other measures to protect your IP address. Network Address Translation (Nat) is proposed as temporary measures to reduce this problem. Other long-term solutions are also proposed, such as the introduction of new IP version, IPv6, and 128-bit.

Even if the Nats needed a temporary solution, has been adopted by all network equipment manufacturers, and is considered very important technology, not only for IP address conservation, but also for many other purposes, including security.

Header contains the IP address source and destination IP addresses, so for IP packets will be properly taken into IP networks. A device which the Network Address Translation you can change the source IP address in the header and not with a different value. For example, the Internal border routers connecting LAN internet, he can take all the source addresses of packets received in the Internal and External interface IP address of the interface (one facing the internet). To do this, we achieve two things: First, we represent a lot of IP addresses is only one address (many-to-one translation), so for IP storage, and second, we hide the IP address of our internal network behind a single address (one facing to the Internet router), thus achieving a better security.



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