Why Eth0 Does Not Exist Anymore386

In the world of networking, the term "eth0" refers to the first Ethernet interface on a computer. It was a common naming convention used in older versions of Linux operating systems, such as Red Hat Enterprise Linux (RHEL) 5 and earlier. However, with the release of RHEL 6 and later, the predictable naming of network interfaces changed to "ens" or "enp," depending on the type of hardware.

The reason for this change was to provide a more consistent and systematic way to identify network interfaces. As hardware evolved and new types of network adapters were introduced, the old eth naming scheme became less reliable. The new naming scheme ensures that network interfaces are always named in a predictable manner, regardless of the underlying hardware.

Here is a breakdown of the new naming scheme:
ens is used for Ethernet interfaces that are integrated into the motherboard.
enp is used for Ethernet interfaces that are connected to the computer via a PCI or PCIe slot.

The number that follows the ens or enp prefix indicates the order in which the interface was detected by the operating system. For example, ens1 would refer to the first Ethernet interface that was detected, while enp2 would refer to the second Ethernet interface that was detected.

If you are using an older version of Linux that still uses the eth naming convention, you can update to a newer version to take advantage of the new naming scheme. You can also manually change the names of your network interfaces to match the new scheme by editing the /etc/udev/rules.d/ file.

Here is an example of a file that uses the new naming scheme:```
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:11:22:33:44:55", NAME="ens1"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="11:22:33:44:55:66", NAME="enp2"
```

Once you have made the changes to the file, you will need to restart the udev service to apply the changes.```
sudo systemctl restart udev
```

After the udev service has been restarted, your network interfaces will be renamed according to the new naming scheme.

The new naming scheme for network interfaces is a more reliable and consistent way to identify network interfaces. It is recommended that you update to a newer version of Linux to take advantage of the new naming scheme, or manually change the names of your network interfaces to match the new scheme.

2025-01-04

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