配置固定ipv6
ipv6_enable="YES"
ipv6_activate_all_interfaces="YES"
# 你的阿里云 IPv6 地址
ifconfig_vtnet0_ipv6="inet6 2408:400a:84b:100:583b:50a4:4acb:d88b prefixlen 64"
# IPv6 网关
ipv6_defaultrouter="2408:400a:84b:100::1"
# 必须关闭，避免干扰静态路由
rtsold_enable="NO"
ip6addrctl_enable="YES"
ip6addrctl_policy="ipv6_prefer"