禁用IPV6的操作步骤
Step 1: add this rule in /etc/sysctl.conf : net.ipv6.conf.all.disable_ipv6=1
Step 2: add this rule in /etc/sysconfig/network: NETWORKING_IPV6=no
Step 3: add this setting for each nic X (X is the corresponding number for each nic) in /etc/sysconfig/network-scripts/ifcfg-ethX: IPV6INIT=no
Step 4: disable the ip6tables service : chkconfig ip6tables off
Step 5: Reload the sysctl configuration:
# sysctl -p
or
# reboot
注意：禁用IPV6后，可能会导致某些服务无法启动,比如VSFTP，对于VSFTP，需要修改/etc/vsftpd/vsftpd.conf文件中的listen和listen_ipv6两个选项：
listen=YES
listen_ipv6=NO
