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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).
Introduction

Introduction

Definition

Dual-Stack Lite (DS-Lite) uses IPv4-in-IPv6 tunneling and IPv4 Network Address translation (NAT) techniques to allow private IPv4 users to travel through IPv6 networks and access public IPv4 networks.

Purpose

Carriers had to face the IPv4 depletion after the Internet Assigned Numbers Authority (IANA) had assigned the last two IPv4 address groups with the mask length of 8 bits in February 2011. Existing address resources can only be used in the short-term running of telecom carrier networks, which cannot meet demands for long-term service development. Existing solutions, such as IPv4 re-addressing or reusing, can only relieve the address exhaustion. Therefore, introducing of IPv6 was considered as the ultimate and direct solution. IPv6, however, brought no commercial opportunities, and existing alternative solutions meet carrier deployment requirement. As a result, there is no sufficient motive to replace IPv4 networks with IPv6 networks.

A good way to implement IPv4-to-IPv6 transition is to deploy NAT and build IPv4 and IPv6 dual-stack networks with dual-stack hosts. Maintaining both IPv4 and IPv6 networks increases the operating expense (OPEX), and existing carriers get more benefits from dual-stack networks than new carriers. New carriers prefer IPv6-only networks because their networks are assigned less IPv4 addresses. In addition, in the later phase of IPv6 evolution, most new networks and services run over IPv6, which makes dual-stack networks less significant. Carriers also face another problem that existing IPv4 or dual-stack users have to go across IPv6-only networks before accessing IPv4 applications. The DS-Lite technique is use to address such a problem.

Benefits

DS-Lite offers the following benefits to carriers:
  • To relieve IPv4 address depletion, DS-Lite allows IPv4 networks to run over IPv6 networks.
  • DS-Lite provides a technical plan for the transition from IPv4 to IPv6 and protects the investment of carriers.
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Updated: 2018-07-04

Document ID: EDOC1100027155

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