切換到 /etc/sysconfig/network-scripts/ 知道自己的網卡名稱(用ifconfig命令 ) 用vim打開對應的文件
添加如下內容（如果已經有相同的參數存在，則修改）
[root@admin network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:B2:F3:30 #網卡名稱
inet addr:192.168.221.128 Bcast:192.168.221.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:feb2:f330/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4845 errors:0 dropped:0 overruns:0 frame:0
TX packets:2956 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1757331 (1.6 MiB) TX bytes:435030 (424.8 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)[root@admin network-scripts]# cd /etc/sysconfig/network-scripts/ | ls
ifcfg-eth0 ifdown-ippp ifdown-routes ifup-bnep ifup-plip ifup-sit network-functions
[root@admin network-scripts]# vim ifcfg-eth0
DEVICE=eth0
HWADDR=00:0C:29:B2:F3:30
TYPE=Ethernet
UUID=0b622218-431e-4f5d-b828-4f23c5c3fef7
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp #1 這三點要改
NETMASK=255.255.255.0 #2
DNS=114.114.114.114 #3需要修改的參數：
BOOTPROTO=dhcp
NETMASK=255.255.255.0
DNS=114.114.114.114重啓服務
service network restart