CentOS7关闭ipv6
sysctl:
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
sysctl -p
/etc/default/grub在quiet后面添加ipv6.disable=1
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet ipv6.disable=1"
grub:
grub2-mkconfig -o /boot/grub2/grub.cfg
重启