Single NIC in Linux system binds multiple IP addresses

Single NIC configuration single IP command

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#ifconfig eth0 192.168.0.1 netmask 255.255.255.0 up Description: Up is to indicate immediate activation

Single NIC configuration multiple IP method is to use the command

If you are configuring multiple IP addresses for a single network adapter eth0, if you use the Ifconfig command, then the place where you need to change is eth0 only, eth0 to Eth0:x (x is 0-255 such as eth0:0 or eth0:1, etc.), eth0: X is called a virtual network interface and is built on top of the network interface.

The code is as follows	Copy Code
#ifconfig eth0:0 192.168.0.1 netmask 255.255.255.0 up #ifconfig eth0:1 192.168.0.2 netmask 255.255.255.0 up

The ping test passes, completes the single NIC configuration multiple IP function.

Note: The IP address will change back after the server restarts, so set the IP setting to activate automatically when you start.

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1. Configure using commands

This is very simple, first look at the current machine IP address, the following command:

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#ifconfig Eth0 Link encap:ethernet hwaddr 00:19:d1:24:2a:ec inet addr:192.168.1.55 bcast:192.168.3.255 mask:255.255.252.0 Inet6 ADDR:FE80::219:D1FF:FE24:2AEC/64 Scope:link Up broadcast RUNNING multicast mtu:1500 metric:1

Note that the red part of the computer, you can see our local IP address is 1.55, then we have to match a 1.56 (pay attention to the local area network with the address conflict OH), the use of the following command:

The code is as follows

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#ifconfig eth0:0 192.168.1.56 netmask 255.255.252.0 #ifconfig eth0  Link encap:ethernet   hwaddr 00:19:d1:24:2a: ec   inet addr:192.168.1.55   bcast:192.168.3.255   Mask:255.255.252.0   Inet6 addr:fe80::219:d1ff:fe24:2aec/64 scope:link  up broadcast RUNNING multicast   MTU:1500    Metric:1 Eth0:0link encap:ethernet hwaddr 00:19:d1:24:2a:ec inet addr:192.168.1.56 bcast:192.168.3.255 mask:255.255.252.0 Up broadcast RUNNING multicast mtu:1500 metric:1 #ping 192.168.1.56 PING 192.168.1.56 (192.168.1.56) bytes of data. Bytes from 192.168.1.56:icmp_seq=1 ttl=64 time=0.045 ms Bytes from 192.168.1.56:icmp_seq=2 ttl=64 time=0.045 ms Bytes from 192.168.1.56:icmp_seq=3 ttl=64 time=0.043 ms #ping 192.168.1.55 PING 192.168.1.55 (192.168.1.55) bytes of data. Bytes from 192.168.1.55:icmp_seq=1 ttl=64 time=0.030 ms Bytes from 192.168.1.55:icmp_seq=2 ttl=64 time=0.022 ms Bytes from 192.168.1.55:icmp_seq=3 ttl=64 time=0.022 ms

This allows us to easily configure another IP address 1.56!

2. Configure using a configuration file

Network card IP configuration files under/etc/sysconfig/network-scripts/, files are ehtx or ethx:x, the following commands are executed:

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#cd/etc/sysconfig/network-scripts/ #cp Ifcfg-eth0 ifcfg-eth0:1

So we simply copy a copy of the current network configuration file, and then we open the copied file, change the IP address of which we want the IP address, such as 192.168.1.57 can!

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#vi ifcfg-eth0:1 Device=eth0 Bootproto=none Hwaddr=00:19:d1:24:2a:ec Onboot=yes Dhcp_hostname=zhongqg.localdomain ipaddr=192.168.1.55 netmask=255.255.252.0 gateway=192.168.0.1 Type=ethernet Userctl=no Ipv6init=no Peerdns=yes

Then modify the red portion of it to 192.168.1.57, and then save the exit and start the configuration file!

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#ifup eth0 : 1