The reason for this should be the same, or is this segment ip ip once a google blacklist ip, because malicious Google Scholar crawling up. The solution is to apply Hurricane Electric Free IPv6 Tunnel Broker, after ipv6 address has washed himself.
Procedure is omitted, relatively simple, there is a corresponding command official, Baidu, there are a lot of tutorials. Wrote a boot before setting ipv6 tunnel, https://www.cnblogs.com/roadwide/p/11266752.html
But then washed enough, or will default access access ipv4 address. You can force access to Google's academic hosts by changing the server ipv6 address, here are the relevant hosts https://raw.githubusercontent.com/lennylxx/ipv6-hosts/master/hosts
In fact, this problem solved before, before the script is to start the default command with the -6 limited ipv6 access solution, it seems there is no set hosts, do not remember. The DNS should be set for the individual $$ Google can also be resolved, Google is the default DNS to resolve the ipv6 address