一、centos6.x完全禁用IPv6的方法
1.修改/etc/sysconfig/network，追加：
echo "NETWORKING_IPV6=no" >>/etc/sysconfig/network
2.修改/etc/hosts,把ipv6的那句本地主机名解析的也注释掉：
#::1 localhost localhost6 localhost6.localdomain6
3.在/etc/modprobe.d/dist.conf结尾添加：
echo "alias net-pf-10 off" >>/etc/modprobe.d/dist.conf
echo "alias ipv6 off" >>/etc/modprobe.d/dist.conf
4、重启系统
reboot
5、查看网卡
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:55:92:db brd ff:ff:ff:ff:ff:ff
inet 192.168.3.22/24 brd 192.168.3.255 scope global eth0