Ipv6 地址分配

手动配置的ipv6不会自动检测重复地址，自动配置的时候会检测

参考：
https://blog.csdn.net/hisense20112784/article/details/46291285
https://blog.csdn.net/Loveychent/article/details/102098329
https://blog.csdn.net/qq_35550345/article/details/86636127

SUSE12上试验：

zypper in radvd
systemctl start radvd.service
systemctl status radvd.service
ip a
主动探测ipv6地址：
ping6 -I eth0
ip -6 neighbor show