##############ipv6##############

cd /etc/sysconfig/network-scripts

vim ifcfg-eth0

  1 DEVICE=eth0

  2 ONBOOT=yes

  3 BOOTPROTO=none

  4 IPADDR=172.25.254.195

  5 NETMASK=255.255.255.0

  6 IPV6INIT=yes

  7 IPV6_AUTOCONF=no

  8 IPV6ADDR=2017::2/64

systemctl restart network

ifconfig

测试

ping 2017::a