步驟1、配置/etc/sysconfig/network-scripts/ifcfg-eth0 裡的文件。it動力的CentOS下的ifcfg-eth0的配置詳情：
[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0DEVICE="eth0"HWADDR="00:0C:29:FD:FF:2A"NM_CONTROLLED="yes"ONBOOT="yes"IPADDR=192.168.1.31NETMASK=255.255.255.0GATEWAY=192.168.1.1BOOTPROTO=static前面三行是系統睚帶的，後面就是手動添加的。 這樣設置扣，記得重啟網卡：
[root@localhost ~]# /etc/init.d/network stop[root@localhost ~]# /etc/init.d/network start行了，現在就可以PING得通網關了，如果還得上網，不必須設置DNS。設置DNS就詳見步驟2
步驟2、修改dns [root@localhost ~]# vi /etc/resolv.conf 在裡面添加二個dns： nameserver 202.96.134.133 nameserver 8.8.8.8
ok，大攻告成，即可上網了！！！！
以下是參考，如果按上面步驟不行，可以詳細看以下內容： 網絡接口配置文件
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0# Intel Corporation 82545EM Gigabit Ethernet Controller (Copper)TYPE=Ethernet #網卡類型DEVICE=eth0 #網卡接口名稱ONBOOT=yes #系統啟動時是否自動加載BOOTPROTO=static #啟用地址協議 --static:靜態協議 --bootp協議 --dhcp協議IPADDR=192.168.1.11 #網卡IP地址NETMASK=255.255.255.0 #網卡網絡地址GATEWAY=192.168.1.1 #網卡網關地址DNS1=10.203.104.41 #網卡DNS地址HWADDR=00:0C:29:13:5D:74 #網卡設備MAC地址BROADCAST=192.168.1.255 #網卡廣播地址重新導入ifcfg-eth0網絡配置文件[root@localhost ~]# /etc/init.d/network reloadShutting down interface eth0: [ OK ]Shutting down loopback interface: [ OK ]Bringing up loopback interface: [ OK ]Bringing up interface eth0: [ OK ]網卡接口關閉與激活 [root@localhost ~]# ifdown eth0 #關閉網絡 [root@localhost ~]# ifup eth0 #啟動網絡
網絡服務啟動與關閉 方法一: [root@localhost ~]# service network stop #關閉網絡服務 [root@localhost ~]# service network start #啟動網絡服務 [root@localhost ~]# service network restart #重啟網絡服務 方法二： [root@localhost ~]# /etc/init.d/network stop [root@localhost ~]# /etc/init.d/network start [root@localhost ~]# /etc/init.d/network restart 網卡狀態查詢 [root@localhost ~]# service network status Configured devices: lo eth0 Currently active devices: lo eth0
臨時配置網卡信息，無需重啟。 [root@localhost ~]# ifconfig eth0 10.1.1.10 netmask 255.0.0.0 查看網卡接口信息，默認列出所有接口
[root@localhost ~]# ifconfigeth0 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-d8940000lo 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)查看當前路由及網關信息 [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：主機名：CentOS主DNS：202.106.46.151第二DNS:202.106.0.20第三DNS:8.8.8.8網絡配置：eth0靜態ip：192.168.1.106子網掩碼 255.255.255.0默認網關 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
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