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。
