iOS IPv6被拒

参考链接：

http://mp.weixin.qq.com/s?__biz=MzI0NTI4ODA2Mw==&mid=2247483863&idx=1&sn=622478d2775c5f8835fe1ed16964552e&scene=23&srcid=0701GkquSx0l7Z6CchTAHFFn#rd

http://www.jianshu.com/p/97b205933c15

http://www.jianshu.com/p/81dfa870ae08