轉(zhuǎn)載：http://blog.csdn.net/ei__nino/article/details/7641183
步驟1覆山、配置/etc/sysconfig/network-scripts/ifcfg-eth0 里的文件镣奋。it動力的CentOS下的ifcfg-eth0的配置詳情：
[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"
HWADDR="00:0C:29:FD:FF:2A"
NM_CONTROLLED="yes"
ONBOOT="yes"
IPADDR=192.168.1.31
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
BOOTPROTO=static
前面三行是系統(tǒng)睚帶的缕碎，后面就是手動添加的键兜。
這樣設(shè)置扣，記得重啟網(wǎng)卡：
[root@localhost ~]# /etc/init.d/network stop
[root@localhost ~]# /etc/init.d/network start
行了坤检，現(xiàn)在就可以PING得通網(wǎng)關(guān)了彰导，如果還得上網(wǎng)鞭衩，不必須設(shè)置DNS。設(shè)置DNS就詳見步驟2
步驟2射赛、修改dns
[root@localhost ~]# vi /etc/resolv.conf
在里面添加二個dns：
nameserver 202.96.134.133
nameserver 8.8.8.8
ok多柑，大攻告成，即可上網(wǎng)了ｉ乖稹？⒐唷！秆麸！
以下是參考初嘹，如果按上面步驟不行，可以詳細(xì)看以下內(nèi)容：
網(wǎng)絡(luò)接口配置文件
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Intel Corporation 82545EM Gigabit Ethernet Controller (Copper)
TYPE=Ethernet?????? #網(wǎng)卡類型
DEVICE=eth0???????? #網(wǎng)卡接口名稱
ONBOOT=yes????????? #系統(tǒng)啟動時是否自動加載
BOOTPROTO=static??? #啟用地址協(xié)議 --static:靜態(tài)協(xié)議 --bootp協(xié)議 --dhcp協(xié)議
IPADDR=192.168.1.11????? #網(wǎng)卡IP地址
NETMASK=255.255.255.0??? #網(wǎng)卡網(wǎng)絡(luò)地址
GATEWAY=192.168.1.1????? #網(wǎng)卡網(wǎng)關(guān)地址
DNS1=10.203.104.41?????? #網(wǎng)卡DNS地址
HWADDR=00:0C:29:13:5D:74 #網(wǎng)卡設(shè)備MAC地址
BROADCAST=192.168.1.255? #網(wǎng)卡廣播地址
重新導(dǎo)入ifcfg-eth0網(wǎng)絡(luò)配置文件
[root@localhost ~]# /etc/init.d/network reload
Shutting down interface eth0:???????????????????????????? [ OK ]
Shutting down loopback interface:???????????????????????? [ OK ]
Bringing up loopback interface:?????????????????????????? [ OK ]
Bringing up interface eth0:?????????????????????????????? [ OK ]
網(wǎng)卡接口關(guān)閉與激活
[root@localhost ~]# ifdown eth0?? #關(guān)閉網(wǎng)絡(luò)
[root@localhost ~]# ifup eth0???? #啟動網(wǎng)絡(luò)
網(wǎng)絡(luò)服務(wù)啟動與關(guān)閉
方法一:
[root@localhost ~]# service network stop??? #關(guān)閉網(wǎng)絡(luò)服務(wù)
[root@localhost ~]# service network start?? #啟動網(wǎng)絡(luò)服務(wù)
[root@localhost ~]# service network restart #重啟網(wǎng)絡(luò)服務(wù)
方法二：
[root@localhost ~]# /etc/init.d/network stop
[root@localhost ~]# /etc/init.d/network start
[root@localhost ~]# /etc/init.d/network restart
網(wǎng)卡狀態(tài)查詢
[root@localhost ~]# service network status
Configured devices:
lo eth0
Currently active devices:
lo eth0
臨時配置網(wǎng)卡信息沮趣，無需重啟屯烦。
[root@localhost ~]# ifconfig eth0 10.1.1.10 netmask 255.0.0.0
查看網(wǎng)卡接口信息，默認(rèn)列出所有接口
[root@localhost ~]# ifconfig
eth0????? Link encap:Ethernet? HWaddr 00:0C:29:13:5D:74
inet addr:192.168.1.11? Bcast:192.168.1.255? Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe13:5d74/64 Scope:Link
UP BROADCAST RUNNING MULTICAST? MTU:1500? Metric:1
RX packets:413 errors:0 dropped:0 overruns:0 frame:0
TX packets:572 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:47701 (46.5 KiB)? TX bytes:64842 (63.3 KiB)
Base address:0x2000 Memory:d8920000-d8940000
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:407 errors:0 dropped:0 overruns:0 frame:0
TX packets:407 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:70759 (69.1 KiB)? TX bytes:70759 (69.1 KiB)
查看當(dāng)前路由及網(wǎng)關(guān)信息
[root@localhost ~]# netstat -r
Kernel IP routing table
Destination???? Gateway???????? Genmask???????? Flags?? MSS Window? irtt Iface
192.168.1.0???? *?????????????? 255.255.255.0?? U???????? 0 0????????? 0 eth0
169.254.0.0???? *?????????????? 255.255.0.0???? U???????? 0 0????????? 0 eth0
default???????? 192.168.1.1???? 0.0.0.0???????? UG??????? 0 0????????? 0 eth0DNS：主機(jī)名：CentOS主DNS：202.106.46.151第二DNS:202.106.0.20第三DNS:8.8.8.8網(wǎng)絡(luò)配置：eth0靜態(tài)ip：192.168.1.106子網(wǎng)掩碼??????? 255.255.255.0默認(rèn)網(wǎng)關(guān) IP???? 192.168.1.1DEVICE=eth0IPADDR=192.168.1.106NETMASK=255.255.255.0BROADCAST=192.168.1.255ONBOOT=yesBOOTPROTO=noneGATEWAY=192.168.1.1TYPE=Ethernet"/etc/sysconfig/network-scripts/ifcfg-eth0" 11L, 187C
