NAT stands for Network address translation and is a method of remapping one ip address to another ip address. This is done to get the internal client connected to internet with private IP address. It is one of the those measures taken to save the IPv4 addresses wastage.
Static NAT
A table is created in the router where each internal IP is associated with external IP ( i.e. registered IP ). This is one Internal IP to another external IP mapping. This is used mainly to access a System from outside Network.
Dynamic NAT
A Nat Router maintains a list of Registered IP. When an internal client needs access to the internet, router maps its ip to one of the registered IP which is not in use.
NAPT
In this there is only one registered IP address in the table. Every time a client needs internet it is assigned a port no. with its ip address. For ex. a client's IP 192.168.0.4 is to be mapped with port 400. Here the internal address will be 192.168.0.0:400 and mapped to registered ip with same port. The response came from internet includes originating port and the router knows whom to forward the response
Static NAT
A table is created in the router where each internal IP is associated with external IP ( i.e. registered IP ). This is one Internal IP to another external IP mapping. This is used mainly to access a System from outside Network.
Dynamic NAT
A Nat Router maintains a list of Registered IP. When an internal client needs access to the internet, router maps its ip to one of the registered IP which is not in use.
NAPT
In this there is only one registered IP address in the table. Every time a client needs internet it is assigned a port no. with its ip address. For ex. a client's IP 192.168.0.4 is to be mapped with port 400. Here the internal address will be 192.168.0.0:400 and mapped to registered ip with same port. The response came from internet includes originating port and the router knows whom to forward the response
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