The Router sets up forward and reverse Easy IP entries that specify the mapping between the source IP address and port number of the packet and the public IP address and port number of the port connected to the public network.The Router receives a request packet sent from the host on the private network for accessing the server on the public network.The Router translates the packet's destination IP address and port number to the private IP address and port number of the host on the private network based on the reverse NAPT entry, and sends the packet to the host.For example, after the translation is performed on the packet sent from the server to Host A, the packet's destination IP address is 10.1.1.100, and its destination port number is 1025.įigure 1-3 Networking diagram for Easy IPĪs shown in Figure 1-3, the Easy IP process is as follows: After receiving a response packet from the server on the public network, the Router queries the reverse NAPT entry based on the packet's destination IP address and port number.The Router translates the packet's source IP address and port number to the public IP address and port number based on the forward NAPT entry, and sends the packet to the server on the public network.For example, after the translation is performed on the packet of Host A, the packet's source IP address is 1.1.1.1, and its port number is 16384. The Router selects an idle public IP address and an idle port number from the IP address pool, and sets up forward and reverse NAPT entries that specify the mapping between the source IP address and port number of the packet and the public IP address and port number.For example, the packet is sent from Host A to Router, its source IP address is 10.1.1.100, and its port number is 1025. After the translation, the packet's source IP address is 2.2.2.2, and its destination IP address is 10.1.1.100.Īs shown in Figure 1-2, the NAPT process is as follows: The Router translates the packet's destination IP address to the private IP address of the host on the private network based on the reverse NAT entry, and sends the packet to the host. After receiving a response packet from the server on the public network, the Router queries the reverse NAT entry based on the packet's destination IP address.
After the translation, the packet's source IP address is 1.1.1.1, and its destination IP address is 2.2.2.2. The Router translates the packet's source IP address to the public IP address based on the forward NAT entry, and sends the packet to the server on the public network. The Router selects an idle public IP address (1.1.1.1) from the IP address pool, and sets up forward and reverse NAT entries that specify the mapping between the source IP address of the packet and the public IP address.
The source IP address of the packet is 10.1.1.100. Figure 1-1 Networking diagram for basic NATĪs shown in Figure 1-1, the basic NAT process is as follows:
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