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How does linux check the mac address? This problem may be often seen in our daily study or work. I hope you can gain a lot from this question. The following is the reference content that the editor brings to you, let's take a look at it!

The commands for linux to check the mac address are: "ifconfig-a" command, "cat / sys/class/net/eth0/address" command, "dmesg | grep eth0" command, "cat / proc/net/arp" command, and so on.

The method of checking mac address by linux

PS: generally, the default Nic file name is eth0, which can be judged to be ethx according to the actual situation area corresponding to the IP address.

1. Ifconfig-a where the HWaddr field is the MAC address, which is the most commonly used method

2. Cat / etc/sysconfig/network-scripts/ifcfg-eth0 (CentOS or Redhat configuration file)

The following two can be viewed before IP is set. It can be used to solve the problem of binding between MAC and operating system. For example, if you install the operating system to a remote server, the mac address of the operating system is the address of host A, and it cannot be started remotely on host B due to different MAC addresses (because the configuration file is still the mac address of An at this time). Because OS detects the hardware at startup, gets the MAC address of the hardware and writes it to the / sys/class/net/eth0/address file, after OS gets the mac address, we write the real mac address to the configuration file before using the original MAC configuration file (that is, / etc/sysconfig/network-scripts/ifcfg-eth0).

3. Cat / sys/class/net/eth0/address check the MAC address of eth0

4. Dmesg | grep eth0

Dmesg' command equipment fault diagnosis is very important. When we connect or disconnect the hardware with the help of the 'dmesg' command, we can see the detection or disconnection information of the hardware.

5. Cat / proc/net/arp check the MAC address of the remote IP connected to the local computer

Can not see the local MAC, can only see the remote connection, the server uses more.

6. Use the ioctl command of SIOCGIFHWADDR to obtain the MAC address in the program

Thank you for reading! After reading the above, do you have a general idea of how linux looks up the mac address? I hope the content of the article will be helpful to all of you. If you want to know more about the relevant articles, you are welcome to follow the industry information channel.

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