Friday, September 23, 2011

Dynamic NAT (Flash Animation)

Here is how dynamic NAT works: Check this Flash Animation link

http://www.cisco.com/image/gif/paws/6450/nat.swf


  • Dynamic NAT – Maps an unregistered IP address to a registered IP address from a group of registered IP addresses. Dynamic NAT also establishes a one-to-one mapping between unregistered and registered IP address, but the mapping could vary depending on the registered address available in the pool, at the time of communication.
    In dynamic NAT, the computer with the IP address of 192.168.32.10 will translate to the first available address in the range from 213.18.123.100 to 213.18.123.150:
    nat-dynamic.jpg

  • NAT operates at the Network layer (Layer 3) of the OSI Reference Model which makes sense, because this is the layer at which routers work:

    nat-osi.jpg
    A real benefit of NAT is apparent in network administration. For example, you can move your Web server or FTP server to another host computer without having to worry about broken links. Simply change the inbound mapping with the new inside local address at the router to reflect the new host. You can also make changes to your internal network easily since the only external IP address either belongs to the router or comes from a pool of global addresses.
    NAT and DHCP are a natural fit, you can choose a range of unregistered IP addresses for your stub domain and have the DHCP server dole them out as necessary. It also makes it much easier to scale up your network as your needs grow. You don't have to request more IP addresses from IANA. You can just increase the range of available IP addresses configured in DHCP and immediately have room for additional computers on your network.

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