為網卡配置多IP

為一塊網卡配置多IP可以通過命令行設置也可以通過配置文件設置，以下我分別通過這兩種方式實現：

1.用命令行設置
ifconfig命令格式：ifconfig 設備名 IP netmask 掩碼 broadcast 廣播地址 動作

[root@localhost root]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0E:1F:01:6C:50
          inet addr:192.168.16.108  Bcast:192.168.16.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:224 (224.0 b)  TX bytes:387 (387.0 b)
          Interrupt:11 Base address:0x2000
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:773 errors:0 dropped:0 overruns:0 frame:0
          TX packets:773 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:52352 (51.1 Kb)  TX bytes:52352 (51.1 Kb)
 
可以看到，當前eth0的IP為192.168.16.108，此時請注意一下MAC(00:0E:1F:01:6C:50)

現在我們為eth0綁定另一個IP，設備為eth0:0，可以看到，現在又多了一個IP，注意，網卡實際上只有一塊（可以看MAC，都為00:0E:1F:01:6C:50)，卻綁定了兩個IP，可以依此配置多個IP。
[root@localhost network-scripts]# ifconfig eth0:0 192.168.1.100 netmask 255.255.255.0
[root@localhost root]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0E:1F:01:6C:50
          inet addr:192.168.16.108  Bcast:192.168.16.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:2879 (2.8 Kb)  TX bytes:387 (387.0 b)
          Interrupt:11 Base address:0x2000
 
eth0:0    Link encap:Ethernet  HWaddr 00:0E:1F:01:6C:50
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:2879 (2.8 Kb)  TX bytes:387 (387.0 b)
          Interrupt:11 Base address:0x2000
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:7329 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7329 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:500674 (488.9 Kb)  TX bytes:500674 (488.9 Kb)

2.通過配置文件設置多IP
網卡IP配置的文件在/etc/sysconfig/network-scripts/下，文件分別為ehtx或ethx:x
[root@localhost root]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls
ifcfg-eth0      ifdown-ippp  ifdown-ppp  ifup-aliases  ifup-isdn   ifup-ppp     ifup-wireless
ifcfg-lo        ifdown-ipv6  ifdown-sit  ifup-ippp     ifup-plip   ifup-routes  init.ipv6-global
ifdown          ifdown-isdn  ifdown-sl   ifup-ipv6     ifup-plusb  ifup-sit     network-functions
ifdown-aliases  ifdown-post  ifup        ifup-ipx      ifup-post   ifup-sl      network-functions-ipv6
#這是eth0的對應的內容
[root@localhost network-scripts]#vi ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
USERCTL=no
PEERDNS=yes
TYPE=Ethernet
IPADDR=192.168.16.108
NETMASK=255.255.255.0
HWADDR=00:0e:1f:01:6c:50
GATEWAY=192.168.16.1
NETWORK=192.168.16.0
BROADCAST=192.168.16.255

配置另一IP，因我們剛才已配置了eth0:0，所以此時要用eth0:1了
[root@localhost network-scripts]# cp ifcfg-eth0 ifcfg-eth0:1
修改配置文件，內容如下
[root@localhost network-scripts]# vi ifcfg-eth0:1
DEVICE=eth0:1
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.2.100
NETMASK=255.255.255.0
NETWORK=192.168.2.0
啟動eth0:1，查看，此時是不是就已經有三個IP了？
[root@localhost network-scripts]# ifup eth0:1
[root@localhost network-scripts]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0E:1F:01:6C:50
          inet addr:192.168.16.108  Bcast:192.168.16.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:52 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:6037 (5.8 Kb)  TX bytes:627 (627.0 b)
          Interrupt:11 Base address:0x2000
 
eth0:0    Link encap:Ethernet  HWaddr 00:0E:1F:01:6C:50
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:52 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:6037 (5.8 Kb)  TX bytes:627 (627.0 b)
          Interrupt:11 Base address:0x2000
 
eth0:1    Link encap:Ethernet  HWaddr 00:0E:1F:01:6C:50
          inet addr:192.168.2.100  Bcast:192.168.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:52 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:6037 (5.8 Kb)  TX bytes:627 (627.0 b)
          Interrupt:11 Base address:0x2000
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:14131 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14131 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:965895 (943.2 Kb)  TX bytes:965895 (943.2 Kb)

OK，配置成功，這個隨便你用哪種方法都可以，用配置文件的方法可以寫一些注釋，而用ifconfig則簡單方便，這就看你的愛好了。 

原文轉自：http://www.kjueaiud.com