在Windows下给一块网卡设置多个IP，是比较容易的，今天我写的内容是关于在Linux系统下，给一块网卡设置多个IP地址，在Linux系统下面，第一块网卡就叫eth0，第二块网卡就叫eth1，这里我们给第一块网卡设置多个IP,在Linux下，配置网卡的配置文件在目录/etc/sysconfig/network-script/下 ，原来网卡的配置文件名为ifcfg-eth0 ，我们给一块网卡配置多个IP地址的配置文件命名为ifcfg-eth0:1和ifcfg-eth0 :2，下面看操作如下：
Last login: Fri Aug 6 00:35:49 2010 from 172.28.102.41
[root@rep1 ~]# ifconfig ###原来网卡的配置
eth0 Link encap:Ethernet HWaddr 00:0C:29:D5:39:A0
inet addr:172.28.90.101 Bcast:172.28.255.255 Mask:255.255.0.0
inet6 addr: fe80::20c:29ff:fed5:39a0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3125184 errors:0 dropped:0 overruns:0 frame:0
TX packets:101356 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:462342976 (440.9 MiB) TX bytes:10788008 (10.2 MiB)
Interrupt:75 Base address:0x2000
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:1427 errors:0 dropped:0 overruns:0 frame:0
TX packets:1427 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3335045 (3.1 MiB) TX bytes:3335045 (3.1 MiB)
[root@rep1 ~]# cd /etc/sysconfig/net
netconsole network networking/ network-scripts/
[root@rep1 ~]# cd /etc/sysconfig/network-scripts/ #配置文件的目录路径
[root@rep1 network-scripts]# ls
ifcfg-eth0 ifdown-isdn ifup-aliases ifup-plip ifup-wireless
ifcfg-lo ifdown-post ifup-bnep ifup-plusb init.ipv6-global
ifdown ifdown-ppp ifup-eth ifup-post net.hotplug
ifdown-bnep ifdown-routes ifup-ippp ifup-ppp network-functions
ifdown-eth ifdown-sit ifup-ipsec ifup-routes network-functions-ipv6
ifdown-ippp ifdown-sl ifup-ipv6 ifup-sit
ifdown-ipsec ifdown-tunnel ifup-ipx ifup-sl
ifdown-ipv6 ifup ifup-isdn ifup-tunnel
[root@rep1 network-scripts]# cp ifcfg-eth0 ifcfg-eth0:1 #复制原来网卡配置
[root@rep1 network-scripts]# cp ifcfg-eth0 ifcfg-eth0:2 #复制原来网卡配置
[root@rep1 network-scripts]# vi ifcfg-eth0:1
# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth0:1 #此处修改
BOOTPROTO=static
BROADCAST=172.28.255.255 #IP地址的广播地址
HWADDR=00:0C:29:D5:39:A0 #MAC地址，不用修改
IPADDR=172.28.90.201 #设置新的IP
NETMASK=255.255.0.0
NETWORK=172.28.0.0
ONBOOT=yes
~
——————————————————————————————————
~
"ifcfg-eth0:1" 9L, 206C written
[root@rep1 network-scripts]# vi ifcfg-eth0:2
# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth0:2 #此处修改
BOOTPROTO=static
BROADCAST=172.28.255.255 #IP地址的广播地址
HWADDR=00:0C:29:D5:39:A0 #MAC地址，不用修改
IPADDR=172.28.90.202 #设置新的IP
NETMASK=255.255.0.0
NETWORK=172.28.0.0
ONBOOT=yes
~
———————————————————————————————————
~
"ifcfg-eth0:2" 9L, 206C written
[root@rep1 network-scripts]# service network restart #重启下网络服务
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
[root@rep1 network-scripts]# ifconfig #修改好后验证是否成功
eth0 Link encap:Ethernet HWaddr 00:0C:29:D5:39:A0
inet addr:172.28.90.101 Bcast:172.28.255.255 Mask:255.255.0.0
inet6 addr: fe80::20c:29ff:fed5:39a0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3131096 errors:0 dropped:0 overruns:0 frame:0
TX packets:101660 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:462925438 (441.4 MiB) TX bytes:10829005 (10.3 MiB)
Interrupt:75 Base address:0x2000