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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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NAT Easy-IP (Easy-IP for short) is a function that reuses interface addresses in NAT scenarios. Specifically, this function can reuse interface addresses from the NAT address pool, section address pool, and port server.


On an enterprise network, public IP addresses are limited, and enterprise users are allowed to apply for public IP addresses only for a limited number of times. To address this issue, Easy-IP is introduced.

Basic Principle

Easy-IP reuses a public network interface's public IP address for NAT. Specifically, the interface's IP address must be the same as the configuration in the address pool so that this IP address can be used as a public IP address for NAT.

Figure 3-15  Basic principle of NAT Easy-IP
As shown in Figure 3-15, the NAT device translates the private IP address of an enterprise network user to the IP address of a public network interface so that traffic can be transmitted from the enterprise network to the carrier network.
  1. The NAT device receives packets sent from the local host for accessing the public server. For example, the source IP address of the packets sent by Host A is, and the port number is 4000.
  2. The NAT device uses the public IP address of the public network interface to establish an Easy IP entry that maps to the source IP address of the internal network. The NAT device can then implement NAT on the received packets based on the interface IP address corresponding to the Easy IP entry. In this example, the source IP address is and the port number is 4101 after NAT is implemented for the packets sent by Host A.
Updated: 2018-07-04

Document ID: EDOC1100027155

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