IP Alias linux中单网卡多IP

最近由于测试的需要,

在一台linux 机器下配置单网卡多个IP,

脚本如下

#!/bin/sh
# ip_alias.sh
#author.....
#20130110
#for addint or delete 1,000 net-card alias
#from 10.3.231.1~200
#from 10.3.232.1~200
#from 10.3.233.1~200
#from 10.3.234.1~200
#from 10.3.235.1~200

#10.3.231.1         168027905    
#10.3.231.200        168028104

#10.3.232.1         168028161
#10.3.232.200        168028360

#10.3.233.1         168028417
#10.3.233.200        168028616

#10.3.234.1         168028673
#10.3.234.200        168028872

#10.3.235.1         168028929
#10.3.235.200        168029128


#usage: sh ip_alias.sh add
#usage: sh ip_alias.sh del

cc_max=235
bb_max=200
ip_pre="10.3."
net_card_num=0;

if [ "$1" == "add" ];
then
for (( i = 231; i <= cc_max ; i ++ ))
do
        for ((j = 1; j <= bb_max; j ++))
        do
                ip=${ip_pre}${i}"."${j}
                let net_card_num+=1;
                echo $net_card_num;
                ifconfig eth0:$net_card_num $ip netmask 255.255.0.0 up
                echo $ip
        done

done
elif [ "$1" == "del" ];
then
        for (( i = 231; i <= cc_max ; i ++ ))
        do
                for ((j = 1; j <= bb_max; j ++))
                do
                        ip=${ip_pre}${i}"."${j}
                        let net_card_num+=1;
                        echo $net_card_num;
                        ifconfig eth0:$net_card_num $ip netmask 255.255.0.0 down
                        echo $ip
                done

done
else
        echo "error parameter"
        echo "#usage: sh ip_alias.sh add"
        echo "#usage: sh ip_alias.sh del"
fi

参考了...

http://bbs.neten.de/viewthread.php?tid=574

IP Alias - linux中单网卡多IP

可以运行命令ifconfig 添加IP Alias 

在eth0:0上添加IP地址192.168.0.128/255.255.255.0
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代码:
# ifconfig eth0:0 192.168.0.128netmask 255.255.255.0 up
删除IP Alias eth0:0
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代码:
# ifconfig eth0:0 down
为一块网卡配置多IP可以通过命令行设置也可以通过配置文件设置，以下我分别通过这两种方式实现：

1.用命令行设置
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代码:
ifconfig命令格式：ifconfig 设备名 IP netmask 掩码 broadcast 广播地址 动作
# ifconfig
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代码:
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，当前eth0的IP为192.168.16.108，此时请注意一下MAC(00:0E:1F:01:6C:50)

现在我们为eth0绑定另一个IP，设备为eth0:0，可以看到，现在又多了一个IP，注意，网卡实际上只有一块（可以看MAC，都为00:0E:1F:01:6C:50)，却绑定了两个IP，可以依此配置多个IP。
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代码:
# ifconfig eth0:0 192.168.1.100 netmask 255.255.255.0
# ifconfig
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代码:
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.通过配置文件设置多IP
网卡IP配置的文件在/etc/sysconfig/network-scripts/下，文件分别为ehtx或ethx:x
# cd /etc/sysconfig/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

#这是eth0的对应的内容
#vi ifcfg-eth0
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代码:
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，因我们刚才已配置了eth0:0，所以此时要用eth0:1了
# cp ifcfg-eth0 ifcfg-eth0:1
修改配置文件，内容如下
# vi ifcfg-eth0:1
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代码:
DEVICE=eth0:1
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.2.100
NETMASK=255.255.255.0
NETWORK=192.168.2.0
启动eth0:1，查看，此时是不是就已经有三个IP了？
# ifup eth0:1
# ifconfig
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代码:
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，这个随便你用哪种方法都可以，用配置文件的方法可以写一些注释，而用ifconfig则简单方便，这就看你的爱好了。

转自：Linux教程-红旗.Redhat操作系统命令学习
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原文地址：https://www.cnblogs.com/vimmer/p/2860668.html