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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
NAT64 Port Allocation

NAT64 Port Allocation

NAT64 port allocation is triggered when a NAT64 device receives the first valid IP packet from an IPv6 terminal.

Port Pre-allocation

In port pre-allocation (port range) mode, a NAT64 device pre-allocates an IPv4 address and a port range to an IPv6 address when mapping the IPv6 address and IPv4 IP address. The IPv4 address and ports in the port range are used in the NAT64 mapping of the IPv6 address. In port pre-allocation mode, the NAT64 device generates a log only when it pre-allocates an IPv4 address and a port range to an IPv6 address. Therefore, the number of generated logs is small.

Semi-dynamic Port Allocation

The semi-dynamic port allocation (Semi-Dynamic) mode is an extension of the port range mode. Semi-dynamic port allocation extends the parameters of the port range mode into three parameters: the initial port range, extended port range, and maximum number of times the port range is extended. When a terminal with an IPv6 address accesses an IPv4 network, a NAT64 device allocates an initial port range and then ports in the port range to the IPv6 address. If the number of ports used by the terminal exceeds the initial port range, the CGN device allocates an extended port range. The maximum number of times the port range is extended determines the number of times the extended port range can be allocated. In semi-dynamic port allocation mode, a NAT64 device generates a log only when it allocates an IPv4 address, initial port range, extended port range, and maximum number of times the port range can be extended to an IPv6 address. Therefore, the number of generated logs is small.

Dynamic Port Allocation

Dynamic port pre-allocation (Port Dynamic) enables a NAT64 device to pre-allocate a public IP address and a port range with 64 ports to a private IP address. If the number of used ports exceeds the initial port range size, the NAT64 device assigns another port range with 64 ports to the user. The allocation process repeats without a limit on the maximum number of extended port ranges.

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Updated: 2018-07-04

Document ID: EDOC1100027155

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