what is NAT..?

The full form of NAT is Network Address translation. It is an internate standard which enables a LAN to use one set of IP addresses for internal traffic and a second set of addressees for external traffic. NAT provides a kind of firewall which works between an internal network and the outside world of networks. It enables a group or company to use more internal IP addresses. It also permits a company to add multiple ISDN connections into a single internate connection. In view to type, there are two types of NAT. One is static and another is dynamic. The former directs an unregistered IP address to a registered one whereas the later directs unregistered to reistered from a group of registered IPs.