 |
| About NAT |
NAT stands for (Network Address Translator). NAT translates the IP addresses of computers in a local network to a single IP address. This address is often used by the router that connects the computers to the Internet. The router can be connected to a DSL modem, cable modem, T1 line, or even a dial-up modem.
NAT gives the Public IP Address against Private IP and Private IP Address against Public IP Address.
IP Recognition.
The IP Address that is recognized on the internet is Public IP Address. The Public IP Address is acceptable.It on active phone lines. The Public IP Address is costly. But the Private IP Address is free of cost.
Private IP Addresses.
There are some IP Addresses that are assigned as Private IP Addresses. These IP's are as follows.
1- 10.0.0.0 to 10.255.255.255
2- 172.16.0.0 to 172.31.255.255
3- 192.168.0.0 to 192.168.255.255
NAT gateways sit between two networks, the inside network and the outside network. Systems on the inside network are typically assigned IP addresses that cannot be routed to external networks (e.g., networks in the 10.0.0.0/8 block). A few externally valid IP addresses are assigned to the gateway.
The NAT mechanism ("natting") is a router feature, and is often part of a corporate firewall. NAT gateways can map IP addresses in several ways:
From a local IP address to one global IP address statically.
From a local IP address to any of a rotating pool of global IP addresses a company may have.
From a local IP address plus a particular TCP port to a global IP address or one in a pool of ports.
From a global IP address to any of a pool of local IP addresses on a round-robin basis.
When a device is assigned a static IP address, the address does not change. Most devices use dynamic IP addresses, which are assigned by the network when they connect and change over time.
Static IP.
A Static IP address is a dedicated IP address that has been assigned to you.
Dynamic IP.
DHCP or Dynamic is an IP address that will automatically be chosen for you from a pool of IP addresses that are assigned in the DHCP scope available on your network.
NAT Details.
It enables private IP networks that use unregistered IP addresses to connect to the Internet. NAT operates on a router, usually connecting two networks together, and translates the private (not globally unique) addresses in the internal network into legal addresses, before packets are forwarded to another network
It allows multiple computers to share a single address. It requires device to perform packet translation.
Site that consists of more than one computer, obtains a single valid IP Address.
It assigns a private address to each computer and uses NAT box to connect to the internet. NAT translates address in IP datagrams.
0 Comments:
Thanks for your comment.