How do i configure eth0

To quickly identify all available Ethernet interfaces, you can use the ip command as shown below. Another application that can help identify all network interfaces available to your system is the lshw command.

This command provides greater details around the hardware capabilities of specific adapters. In the example below, lshw shows a single Ethernet interface with the logical name of eth0 along with bus information, driver details and all supported capabilities. Interface logical names can also be configured via a netplan configuration.

If you would like control which interface receives a particular logical name use the match and set-name keys. The match key is used to find an adapter based on some criteria like MAC address, driver, etc. Then the set-name key can be used to change the device to the desired logial name. The following is an example of how to view supported features and configured settings of an Ethernet interface.

The following section describes the process of configuring your systems IP address and default gateway needed for communicating on a local area network and the Internet. The ip command allows you to configure settings which take effect immediately, however they are not persistent and will be lost after a reboot. To temporarily configure an IP address, you can use the ip command in the following manner.

Modify the IP address and subnet mask to match your network requirements. To verify the IP address configuration of enp0s25, you can use the ip command in the following manner. To configure a default gateway, you can use the ip command in the following manner.

Modify the default gateway address to match your network requirements. To verify your default gateway configuration, you can use the ip command in the following manner. A more lengthy description of the proper persistent way to do DNS client configuration is in a following section. If you no longer need this configuration and wish to purge all IP configuration from an interface, you can use the ip command with the flush option as shown below.

The example below assumes you are configuring your first Ethernet interface identified as enp3s0. The example below assumes you are configuring your first Ethernet interface identified as eth0.

Change the addresses , gateway4 , and nameservers values to meet the requirements of your network. The loopback interface is identified by the system as lo and has a default IP address of Interface configuration ifcfg files control the software interfaces for individual network devices.

As the system boots, it uses these files to determine what interfaces to bring up and how to configure them. These files are usually named ifcfg- name , where the suffix name refers to the name of the device that the configuration file controls. By convention, the ifcfg file's suffix is the same as the string given by the DEVICE directive in the configuration file itself.

See Where to specify bonding module parameters for more information. This directive is deprecated, as the value is calculated automatically with ipcalc. This is the default value. An IPv6 link-local address will still be assigned by default. For example, if you wanted to force Mb, full duplex:.

Custom initscripts run outside of the network init script lead to unpredictable results during a post-boot network service restart.

Changing speed or duplex settings almost always requires disabling auto-negotiation with the autoneg off option. This option needs to be stated first, as the option entries are order-dependent. See Section This directive must be used in machines containing more than one NIC to ensure that the interfaces are assigned the correct device names regardless of the configured load order for each NIC's module.

It is used for configurations with multiple IP addresses on an interface.