翻译：译成英文

Abstract

Althought IPv4 has already been proved an unbelievable success, with the constant emerging of new application, the traditional IPv4 protocol is hardly adequate in supporting the further expansion of the internet and satisfing the new operations' characteristics. . In adition to the problems with its expansibility, management, routing, improvment of quality services and security, IPv4 experiences the remarkable growing shortage of addresses. The transition to IPv6 becomes exigent.

【仅供参考】