Network-Interface

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To find the network interface on Linux, you can use the ifconfig or ip command in the terminal. 

Here's how you can use ifconfig: 

1. Open the terminal on your Linux system. 

2. Type ifconfig and press Enter. 

3. You'll see a list of network interfaces along with their IP addresses, netmasks, and other information. 

Here's how you can use ip: 

1. Open the terminal on your Linux system. 

2. Type ip addr and press Enter. 

3. You'll see a list of network interfaces along with their IP addresses, netmasks, and other information. 

Both ifconfig and ip commands can be used to display the network interface configurations. ip is the newer and more powerful command to configure and display the network interfaces, and ifconfig is the legacy command that can still be used on some older Linux distributions. 

/etc/sysconfig/network-scripts 

 

# Generated by VMWare customization engine. 

NAME=ens192 

GATEWAY=10.170.20.6 

HWADDR=00:50:56:9A:0F:D1 

ONBOOT=yes 

USERCTL=no 

NETMASK=255.255.252.0 

IPADDR=10.170.20.48 

IPV6INIT=no 

  

#NM: check_link_down() { 

#NM:  return 1; 

#NM: } 

TYPE=Ethernet 

PROXY_METHOD=none 

BROWSER_ONLY=no 

PREFIX=22 

DEFROUTE=yes 

IPV4_FAILURE_FATAL=no 

IPV4_ROUTE_METRIC=100 

IPV6_DEFROUTE=yes 

IPV6_FAILURE_FATAL=no 

IPV6_ADDR_GEN_MODE=default 

UUID=03da7500-2101-c722-2438-d0d006c28c73 

sbalakrishnan@pdnsserver03-cc:/etc/sysconfig/network-scripts$ pwd 

 

Check if your system is using Network Manager or  

 

sbalakrishnan@pdnsserver03-cc:/etc/sysconfig/network-scripts$ systemctl status NetworkManager 

● NetworkManager.service - Network Manager 

   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled) 

   Active: active (running) since Fri 2023-02-03 06:49:11 PST; 1 months 18 days ago 

     Docs: man:NetworkManager(8) 

Main PID: 6745 (NetworkManager) 

    Tasks: 3 (limit: 22867) 

   Memory: 3.5M 

   CGroup: /system.slice/NetworkManager.service 

           └─6745 /usr/sbin/NetworkManager --no-daemon 

 

 

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Check the network configuration file. 

 

In Linux, the name of the network interface configuration file varies depending on the network configuration tool being used. 

1. NetworkManager: If your system is configured to use NetworkManager for network configuration, the interface configuration file will be located in the /etc/sysconfig/network-scripts directory and the name of the file will be ifcfg-<interface-name>. 

For example, if the interface name is eth0, the configuration file will be /etc/sysconfig/network-scripts/ifcfg-eth0. 

1. systemd-networkd: If your system is using systemd-networkd, the interface configuration file will be located in the /etc/systemd/network directory and the name of the file will be <interface-name>.network. 

For example, if the interface name is eth0, the configuration file will be /etc/systemd/network/eth0.network. 

1. ifupdown: If your system is using ifupdown, the interface configuration file will be located in the /etc/network/interfaces file. 

For example, to configure the eth0 interface, you would add the following lines to the /etc/network/interfaces file: 

 

auto eth0 

iface eth0 inet static 

    address 192.168.1.100 

    netmask 255.255.255.0 

    gateway 192.168.1.1 

 

How to check if your system is using network manager or systemd-networkd 

 

You can check whether your Linux system is using NetworkManager or systemd-networkd as its network configuration tool by using the following commands: 

1. Check for NetworkManager: 

 

systemctl status NetworkManager 

 

 

If the output shows that the NetworkManager service is running, then your system is using NetworkManager for network configuration. 

1. Check for systemd-networkd: 

 

If the output shows that the systemd-networkd service is running, then your system is using systemd-networkd for network configuration. 

Note that in some cases, your system may be using both NetworkManager and systemd-networkd, or a different network configuration tool altogether. In such cases, it is best to consult the documentation for your specific Linux distribution to determine which network configuration tool is being used.