> ## Documentation Index
> Fetch the complete documentation index at: https://docs.siderolabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Predictable Interface Names

> How to use predictable interface naming.

export const VersionWarningBanner = () => {
  const latestVersion = "v1.13";
  const [latestUrl, setLatestUrl] = useState(null);
  const [currentVersion, setCurrentVersion] = useState(null);
  const [isBeta, setIsBeta] = useState(false);
  const parseVersion = v => v.replace("v", "").split(".").map(Number);
  const isGreaterVersion = (a, b) => {
    const [aMajor, aMinor] = parseVersion(a);
    const [bMajor, bMinor] = parseVersion(b);
    if (aMajor > bMajor) return true;
    if (aMajor === bMajor && aMinor > bMinor) return true;
    return false;
  };
  useEffect(() => {
    if (typeof window === "undefined") return;
    const {pathname, hash, search} = window.location;
    const match = pathname.match(/\/talos\/(v\d+\.\d+)\//);
    if (!match) return;
    const detectedVersion = match[1];
    if (detectedVersion === latestVersion) return;
    setCurrentVersion(detectedVersion);
    if (isGreaterVersion(detectedVersion, latestVersion)) {
      setIsBeta(true);
    }
    const newPath = pathname.replace(`/talos/${detectedVersion}/`, `/talos/${latestVersion}/`);
    setLatestUrl(`${newPath}${search}${hash}`);
  }, []);
  if (!latestUrl || !currentVersion) return null;
  return <div className="not-prose sticky top-6 z-50 my-6">
      <div className="border border-yellow-500/30 bg-yellow-500/10 px-4 py-3 rounded-xl">
        <div className="text-sm">
          {isBeta ? <>
              ⚠️ You are viewing a <strong>beta version</strong> of Talos ({currentVersion}).
              This version may be unstable.
              <a href={latestUrl} className="ml-2 underline text-yellow-400 hover:text-yellow-300 font-medium">
                View latest stable version {latestVersion} →
              </a>
            </> : <>
              ⚠️ You are viewing an older version of Talos ({currentVersion}).
              <a href={latestUrl} className="ml-2 underline text-yellow-400 hover:text-yellow-300 font-medium">
                View the latest version {latestVersion} →
              </a>
            </>}
        </div>
      </div>
    </div>;
};

<VersionWarningBanner />

Starting with version Talos 1.5, network interfaces are renamed to [predictable names](https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/)
same way as `systemd` does that in other Linux distributions.

The naming schema `enx78e7d1ea46da` (based on MAC addresses) is enabled by default, the order of interface naming decisions is:

* firmware/BIOS provided index numbers for on-board devices (example: `eno1`)
* firmware/BIOS provided PCI Express hotplug slot index numbers (example: `ens1`)
* physical/geographical location of the connector of the hardware (example: `enp2s0`)
* interfaces's MAC address (example: `enx78e7d1ea46da`)

The predictable network interface names features can be disabled by specifying `net.ifnames=0` in the kernel command line.

> Note: Talos automatically adds the `net.ifnames=0` kernel argument when upgrading from Talos versions before 1.5, so upgrades to 1.5 don't require any manual intervention.

"Cloud" platforms, like AWS, still use old `eth0` naming scheme as Talos automatically adds `net.ifnames=0` to the kernel command line.

## Single Network Interface

When running Talos on a machine with a single network interface, predictable interface names might be confusing, as it might come up as `enxSOMETHING` which is hard to address.
There are two ways to solve this:

* disable the feature by supplying `net.ifnames=0` to the initial boot of Talos, Talos will persist `net.ifnames=0` over installs/upgrades.
* use [device selectors](./device-selector):

  ```yaml theme={null}
  machine:
    network:
      interfaces:
        - deviceSelector:
            busPath: "0*" # should select any hardware network device, if you have just one, it will be selected
          # any configuration can follow, e.g:
          addresses: [10.3.4.5/24]
  ```