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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).
What Is CGN?

What Is CGN?

Background

The Internet Assigned Numbers Authority (IANA) allocated the last two /8s of IPv4 address space in February 2011. With this action, the free pool of available IPv4 addresses is now fully depleted. The existing solutions, such as IPv4 readdressing and address reusing, cannot fundamentally resolve the IPv4 address exhaustion problem. Telecom carriers' existing address space can only support service development in a short term. The industry is in desperate need of a solution for long-term service development.

The introduction of IPv6 is considered the most fundamental solution to IPv4 address exhaustion. However, the slow-paced IPv6 implementation has not yet brought new business opportunities in essence. It only addresses the existing address issues. In addition, the current substitute solutions can basically meet carriers' deployment requirements, which in turn slows down their plan in IPv6 transition.

Figure 2-1  IPv6 transition

Concepts

Carrier-grade NAT (CGN) is a large-scale NAT (for details, see Figure 2-2.) that delivers statistical reuse of public IPv4 addresses through large-scale private IPv4 address deployment. The use of CGN can improve the usage of IPv4 addresses, which solves IPv4 address exhaustion to a great extent and leaves more time for IPv6 transition. Mainstream IPv6 evolution solutions, such as dual-stack + NAT444 and DS-Lite solutions, have all introduced CGN. With this trend, Huawei concludes a series of IPv6 evolution solutions as the CGN solution.

Figure 2-2  Comparison between NAT and CGN
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Updated: 2018-07-04

Document ID: EDOC1100027155

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