What is the scope of the ifconfig command?

The scope of the ifconfig command is: 1. Use the ifconfig command to view the information of the network card, the code is [ifconfig [Interface]]; 2. Use the ifconfig command to configure the IP address of the network card, the code is [ifconfig eth0 192.168 .0.].

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ifconfig command scope The ones are:

1. ifconfig is to check the network card information.

ifconfig [Interface]

Interface is optional. If this item is not added, information about all network cards in the system will be displayed. If you add this option, the specified network card information will be displayed

For example: ifconfig eth0

eth0 Link encap:Ethernet
            HWaddr 00:0C:29:F3:3B:F2
            inet addr:192.168.0.10 Bcast:192.168.0.255 Mask:255.255.255.0
            UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
            RX packets:78 errors:0 dropped:0 overruns:0 frame:0
            TX packets:104 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:100
            RX bytes:11679 (11.4 Kb)
            TX bytes:14077 (13.7 Kb)
            Interrupt:10 Base address:0x1080

We can see

The first line: Connection type: Ethernet (Ethernet) HWaddr (hardware mac address)

Second line: IP address, subnet, mask of the network card

Third line: UP (represents the network card open status) RUNNING (represents the network cable of the network card is Continued) MULTICAST (supports multicast) MTU: 1500 (maximum transmission unit): 1500 bytes

The fourth and fifth lines: statistics on receiving and sending data packets

The seventh line: receiving , send data bytes statistics.

2. ifconfig configure the network card

Configure the IP address of the network card

ifconfig eth0 192.168.0.1 netmask 255.255.255.0

Configure the IP address and 24-bit mask of 192.168.0.1 on eth0 code. What if I want to configure an IP address of 192.168.1.1/24 on eth0? Use the following command

ifconfig eth0:0 192.168.1.1 netmask 255.255.255.0

and then use the ifconifg command to view it. You can see the information of the two network cards, which are: eth0 and eth0:0. If you want to add more IPs, then the network card names will be: eth0:1, eth0:2...fill in as many as you want. OK!

Configure the hardware address of the network card

ifconfig eth0 hw ether xx：xx：xx：xx：xx：xx

The hardware address of the network card will be changed. At this time, you can deceive the IP address bonding in the LAN.

Disable the network card

ifconfig eth0 down

Enable the network card

ifconfig eth0 up

The ifconfig command is very powerful and can also set the MTU of the network card, promiscuous mode, etc. I won’t introduce them one by one. You can study them yourself in time.

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