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使用VirtualBox装了很多虚拟机，默认采用的DHCP的方式，但是随着虚拟机越来越多以后，这种方式很不方便，所以需要将机器的IP都设置为静态IP
需要添加的几项内容的解释：
IPADDR IP地址
NETMASK 子网掩码
NETWORK 网关地址
通常，如果我们想更改主机地址为静态地址或者更改主机名，需要修改的几个文件包括：
/etc/sysconfig/network 设置主机名和网络配置
/etc/sysconfig/network-scripts/ifcfg-eth0 针对特定的网卡进行设置
/etc/resolv.conf 设置DNS
/etc/hosts 设置指定的域名解析地址
一般我们只需要修改网卡的配置文件就可以了，例如我的配置文件如下：
DEVICE=eth0
BOOTPROTO=static
TYPE=Ethernet
NAME=”System etho0″
BROADCAST=192.168.56.255
HWADDR=08:00:27:24:F8:9B
IPADDR=192.168.56.101
IPV6INIT=yes
IPV6_AUTOCONF=yes
NETMASK=255.255.255.0
NETWORK=192.168.56.1
ONBOOT=yes
设置完成后，重启一下网卡就可以了：service network restart
我们还有一个办法可以实现设置静态IP，那就是通过 ifconfig 这个命令。通常，我们都用它来查看当前网卡的一些信息，同时，他也可以用来进行一些网卡信息的设置。
修改的命令如下：ifconfig eth0 192.168.56.102
但是，这个命令执行后，只能够在当前会话中修改网卡的地址，我们看一下 ifcfg-eth0 的配置文件，仍然是
# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
HWADDR=08:00:27:43:73:2f
也就是说重新启动服务器后，仍然会按照配置文件中的方式进行IP的获取。
所以，如果需要修改IP为静态IP的话，最好的方式还是通过修改配置文件来完成。
如果你ping的是广域网而不是局域网，那你还要确保网关和DNS设置正确
你可以按下面的步骤来设置网关
这条命令就可以搞定
route add default gw 192.168.1.1
后面那是你的网关。
现在 route 一下
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
default my.router 0.0.0.0 UG 0 0 0 eth0
之前如果没有添加 的话， 只有上面的第一条。 第二条是新加进去的。
如果还访问不了， 哪你的情况可能有点特殊哦。
这样重启以后 就不能 用了。
修改
编辑 /etc/network/interfaces
添加 gateway 192.168.1.1
DNS记录在/etc下的resolv.conf这个文件里。可以按resolv.conf文件的格式修改DNS。如果没有resolv.conf就建一个。
然后service network restart
ping 下试试。
参考资料：
1、用ifconfig设置参数遇到的问题
2、手动设置CentOS的IP
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