开启 IPv4 优先

sed -i 's/^#precedence ::ffff:0:0\/96  100/precedence ::ffff:0:0\/96 100/' /etc/gai.conf

开启 IPv6 优先

sed -i 's/^precedence ::ffff:0:0\/96  100/#precedence ::ffff:0:0\/96 100/' /etc/gai.conf

查看优先ip

curl ip.sb