What is ifcfg-eth0 in linux

In Linux, "ifcfg-eth0" is the command to set the network card interface parameters; ifcfg is the command to set the network interface parameters, eth0 is the interface name of the network card, 0 represents the number of the interface; you can use this The command adds, deletes or stops the network card interface. The syntax is "ifcfg-eth0 parameter ip address".

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is ifcfg-eth0 in Linux

In Linux, eth0 is often the interface name of the network card. 0 is the Arabic numeral zero, indicating the number of the interface, because there may be multiple network cards; the number 0 precedes eth is the abbreviation of the word Ethernet (abbreviations and abbreviations of words widely used in the field of computer technology). Ethernet means Ethernet, so eth means that the network card interface is an Ethernet card interface.

The ifcfg command is a Bash script program used to set network interface parameters in Linux.

Syntax format:

ifcfg [device] [cmd]  [address]

device is the network card device, it may have aliases. cmd can be add, delete, stop. address is the ip address.

Examples are as follows:

Stop specifying an IP address on a network interface:

[root@linux265 ~]# ifcfg eth0 stop

Configure an IP address for a network interface:

[root@linux265 ~]# ifcfg eth1 add 192.168.60.11/24

Add ip Address

[root@localhost ~]# ifcfg eth0 add 192.168.0.250/24                     //添加地址250
Forwarding is ON or its state is unknown (4). OK, No RDISC.
[root@localhost ~]#ifconfig                                               //查看网络信息
eth0      Link encap:Ethernet  HWaddr 08:00:27:14:33:57  
          inet addr:192.168.0.250  Bcast:192.168.0.255 Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe14:3357/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500 Metric:1
          RX packets:107276 errors:0 dropped:0 overruns:0 frame:0
          TX packets:72250 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:83580745 (79.7 MiB)  TX bytes:5842176 (5.5 MiB)

Delete ip address

[root@localhost ~]# ifcfg eth0 delete 192.168.0.250/24                   //删除网卡地址
Forwarding is ON or its state is unknown (4). OK, No RDISC.
[root@localhost ~]# ifconfig                                                 //查看网卡信息，ip地址已经删除
eth0      Link encap:Ethernet  HWaddr 08:00:27:14:33:57  
          inet6 addr: fe80::a00:27ff:fe14:3357/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500 Metric:1
          RX packets:107276 errors:0 dropped:0 overruns:0 frame:0
          TX packets:72251 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:83580745 (79.7 MiB)  TX bytes:5842218 (5.5 MiB)

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