vim /etc/sysconfig/network-script/ifcfg-eth0
修改成：
DEVICE="eth0"
BOOTPROTO="static"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
UUID="不动"
HWADDR=不动
IPADDR=10.207.27.251
PREFIX=24
GATEWAY=10.207.27.1
NETMASK=255.255.255.0
DNS1=8.8.8.8
DOMAIN=4.4.4.4
DEFROUTE=yes
NAME="System eth0"
在百度百科看下SElinux的作用：
http://baike.baidu.com/view/487687.htm
vim /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
#SELINUX=enforcing
# SELINUXTYPE= can take one of these two values:
# targeted - Targeted processes are protected,
# mls - Multi Level Security protection.
#SELINUXTYPE=targeted
iptables /etc/sysconfig/iptables