验证ipv6是否关闭

cat /proc/sys/net/ipv6/conf/all/disable_ipv6
0：开启状态
1：关闭状态

方法一：开机不加载IPv6模块

1 2	vi /etc/default/grub GRUB_CMDLINE_LINUX="ipv6.disable=1 crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"

1	grub2-mkconfig -o /boot/grub2/grub.cfg

1 2	reboot lsmod \|grep ipv6

1 2	vi /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6=1

1 2	vi /etc/sysconfig/network NETWORKING_IPV6=no

1 2	vi /etc/sysconfig/network-scripts/ifcfg-XX IPV6INIT=no

sysctl -p