Define network interface in netplan ( Ubuntu 24.04) - AI generated

In Ubuntu 24.04, `netplan` is the default network configuration tool, and it uses YAML configuration files located in `/etc/netplan/`. Below is how you can configure the network interfaces as described in your original request using `netplan`.


---


### Step 1: Locate the Netplan Configuration File

Netplan configuration files are typically located in `/etc/netplan/`. The file might be named something like `01-netcfg.yaml`, `50-cloud-init.yaml`, or similar. You can list the files in the directory using:


```bash

ls /etc/netplan/

```


Open the file in a text editor with root privileges:


```bash

sudo nano /etc/netplan/01-netcfg.yaml

```


---


### Step 2: Configure the Management Interface

Assuming the management interface is `eth0`, add the following configuration for a static IP address:


```yaml

network:

  version: 2

  renderer: networkd

  ethernets:

    eth0:

      addresses:

        - 10.0.0.11/24

      routes:

        - to: 0.0.0.0/0

          via: 10.0.0.1

      nameservers:

        addresses:

          - 8.8.8.8

          - 8.8.4.4

```


- `eth0`: The name of the management interface.

- `addresses: 10.0.0.11/24`: Sets the IP address and subnet mask (equivalent to `255.255.255.0`).

- `routes`: Configures the default gateway (`10.0.0.1`).

- `nameservers`: Optional DNS servers (you can customize these).


---


### Step 3: Configure the Provider Interface

For the provider interface (e.g., `eth1`), configure it as a manual interface without an IP address:


```yaml

    eth1:

      dhcp4: no

      dhcp6: no

      optional: true

```


- `eth1`: The name of the provider interface.

- `dhcp4: no` and `dhcp6: no`: Disable DHCP for IPv4 and IPv6.

- `optional: true`: Makes the interface optional (useful for interfaces that may not always be connected).


---


### Step 4: Complete Netplan Configuration File

Here’s how the complete `/etc/netplan/01-netcfg.yaml` file might look:


```yaml

network:

  version: 2

  renderer: networkd

  ethernets:

    eth0:

      addresses:

        - 10.0.0.11/24

      routes:

        - to: 0.0.0.0/0

          via: 10.0.0.1

      nameservers:

        addresses:

          - 8.8.8.8

          - 8.8.4.4

    eth1:

      dhcp4: no

      dhcp6: no

      optional: true

```


---


### Step 5: Apply the Configuration

After editing the file, apply the changes using the following command:


```bash

sudo netplan apply

```


---


### Step 6: Verify the Configuration

You can verify the configuration using the following commands:


1. Check the IP addresses:

   ```bash

   ip addr show

   ```


2. Check the routing table:

   ```bash

   ip route show

   ```


3. Check the status of the interfaces:

   ```bash

   networkctl status

   ```


---


### Notes:

- Replace `eth0` and `eth1` with the actual names of your network interfaces. You can find the interface names using:

  ```bash

  ip link show

  ```


- If you are using a different renderer (e.g., `NetworkManager` instead of `networkd`), replace `renderer: networkd` with `renderer: NetworkManager`.


- If you encounter issues, you can debug the configuration with:

  ```bash

  sudo netplan --debug apply

  ```


This configuration will set up the management interface with a static IP and the provider interface without an IP address, as required.

( Generated using DeepSeek AI)

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