IPv6 is the key technology to solve the majority of the shortcoming and problems of IPV4, but IPv6 can not replace IPv4 in a short time. There will be a period when the two version of the protocol co-exist.

• IPv6是解决IPv4局限性和缺陷的关键技术,但IPv6不可能在一夜之间代替IPv4,IPv4和IPv6将会有一个很长的共存期。