单网卡绑定多个IP

在windows下，一个网卡可以绑定多个IP地址，只要在网卡的“TCP/IP 属性”的“高级”选项中添加具体的IP地址就可以实现了
在LINUX下面一样可以实现,而且相当简单
操作步骤如下：

[root@ns1 ~]# cd /etc/sysconfig/network-scripts/

[root@ns1 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@ns1 network-scripts]# cp ifcfg-eth0 ifcfg-eth0:1

[root@ns1 network-scripts]# vi ifcfg-eth0:1

# Digital Equipment Corporation DECchip 21140 [FasterNet]
DEVICE=eth0:1
BOOTPROTO=static
HWADDR=00:03:FF:43:1A:B9
ONBOOT=yes
IPADDR=192.168.0.30
NETMASK=255.255.255.0

[root@ns1 network-scripts]# cd
[root@ns1 ~]# service network restart
Shutting down interface eth0:                              [ OK ]
Shutting down loopback interface:                          [ OK ]
Bringing up loopback interface:                            [ OK ]
Bringing up interface eth0:                                [ OK ]

[root@ns1 ~]# ifconfig
eth0      Link encap:Ethernet HWaddr 00:03:FF:43:1A:B9
          inet addr:192.168.0.20 Bcast:192.168.0.255 Mask:255.255.255.0
          inet6 addr: fe80::203:ffff:fe43:1ab9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:9137 errors:11 dropped:0 overruns:0 frame:0
          TX packets:7251 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:775430 (757.2 KiB) TX bytes:905855 (884.6 KiB)
          Interrupt:11 Base address:0x6000

eth0:1    Link encap:Ethernet HWaddr 00:03:FF:43:1A:B9
          inet addr:192.168.0.30 Bcast:192.168.0.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          Interrupt:11 Base address:0x6000

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:116 errors:0 dropped:0 overruns:0 frame:0
          TX packets:116 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:10687 (10.4 KiB) TX bytes:10687 (10.4 KiB)


注意:eth0在这里可以设置为DHCP获得IP,但是eth0:1就不可以用DHCP了,必须设置成静态IP