无状态 1:N IVI 支持IPv4主动访问IPv6（IVI6）吗？

如题
draft-xli-behave-divi-02-Address-sharing stateless double IVI有这样两段描述

   The stateless 1:N IVI keeps the features of stateless, end-to-end
   address transparency and bidirectional-initiated communications of
   the original stateless 1:1 IVI, while it can utilize the IPv4
   addresses more effectively.  The stateless 1:N dIVI has above
   features and it does not require the DNS64/DNS46 and ALG supports.

   Therefore, the IPv6 end systems must follow the port number range
   defined by the extended IPv4-translatable addresses.  The behavior of
   the IPv6 end system when communicating with the IPv4 Internet are:
   o  If the IPv6 end system is used as a server, different well-known
      ports will be served by different IPv6 hosts.
   o  If the IPv6 end system is used as a client, the end system must
      generate the source port numbers in the range defined by the
      extended IPv4-translatable address format.  This can be done by
      modification of the end system, or via a port number mapping
      device (home gateway).

看来是受限制的双向互通
比如IP A能做ftp服务器，不能做http服务器，因为他可用的端口范围包括21，不包括80

首先，Draft文档是经常会变动的，尤其是早期的编号01,02这种，肯定会或多或少存在问题
请先参考下本论坛的此帖子：
http://www.ipv6bbs.cn/thread-88-1-1.html
或参考IETF网站的“IETF之路”，里面写的更加详细。
确认下当前最新的draft编号，然后再进行熟悉吧，当然，也许后续仍然会有变化，肯定需要持续跟进，例如查看diff文件，或者你们也可以参与进去讨论！