#Linux show mac address of interface how to
#Linux show mac address of interface mac

#Linux show mac address of interface mac

We want the MAC address which is a 12 digit hexadecimal number. We will then use the grep command which is used to search for a specified pattern. The ifconfig command ( interface configuration) allows us to view the configuration of all the network interfaces on your system. Pre-requisites: Regular Expressions and grep command in Linux. System(command1) Second Approach using Regular expressions and ifconfig: Enter the ip link command into the terminal, as shown below: ip link show. There is a unique MAC address for each device on the network that is connected to the computer. Any network device has a critical parameter, such as a MAC address, that will also include the hardware of the computer or a server. String str1 = 'cat /sys/class/net/eth0/address' Ĭonst char *command1 = str1.c_str() //c_str() converts the string into a C-Style string Finding the MAC Address of a Linux System. (/sys/class/net/eth0/address contains the MAC address). Now we will use the cat command to display the text in this file. If you have a different interface name change the following path accordingly: /sys/class/net/eth0/address In all Linux based systems eth0 is the default network interface. We will discuss two ways to get the MAC address. Please keep in mind that you should not use a lot of system() calls in a program as they are expensive to call (resource-wise). We will be using system() call through a C++ program that directly communicates with the OS (Operating System) and allows us to use the Linux commands. It acts like a unique ID used to communicate within a network. The MAC address or Media Access Control Address is a 12 digit hexadecimal number. With the help of this tutorial, you will be able to easily find out the MAC address of your Linux device by just running a simple C++ program.

#Linux show mac address of interface how to

In the above example, XXXXXXXXXXXX and YYYYYYYYYYY are the MAC Address of the two LAN connections in use.In this post, we will learn how to find the MAC address of a Linux Device by using a C++ program. The second line should always indicate the type of link layer in use and the current hardware address (MAC Address). The first line summarizes the current name of the device, the flags set on the device, the maximum transmission unit (MTU) and so on. You can use this command to view entries that you want to. The ip utility should list several parameters of the device. For each device, two lines should summarize the link state and characteristics. (Optional) Display the persistent MAC addresses learned for all interfaces or a specified interface.

Link/ether YYYYYYYYYYYY brd ff:ff:ff:ff:ff:ff Link/ether XXXXXXXXXXXX brd ff:ff:ff:ff:ff:ffģ: wlp2s0: mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000 Launch Terminal and enter the ip link command: ip link showĮxample Output: 1: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000Ģ: enp1s0: mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 Every PC’s network device should have a unique MAC address. MAC address is another critical parameter of a network device, including your PC’s hardware or a server. Typically, eth0 is for Ethernet connection, and wlp2s0 for Wireless connection.įor example, use eth0 : ip addr show eth0 Finding the MAC Address of the Linux System Inet6 1:2:00:33:333/64 scope global mngtmpaddr noprefixroute dynamic Valid_lft 548176sec preferred_lft 61403sec Inet6 AB:AD:AK:AI/64 scope global temporary dynamic Valid_lft 61791sec preferred_lft 61791sec Sample Output: 1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 ip route list | grep defaultĪlternatively, you can also use device name in particular too, but you should know the names of network devices for that. If you are only interested in the default IP address that connects to the internet, use a grep parameter to list that one. It should display all available IP address including device names. ip route list ip route list command usage in Ubuntu 17.10 Launch ‘Terminal’ and enter the following command to list all the IP address. s to display more information about the command ip command usage in Ubuntu 17.10 Finding the IP address of the Linux System Where xx must be replaced with one of the following to get the desired output.