---
title: How to configure jumbo frames on Scaleway Dedibox RPN
description: This page explains how to configure jumbo frames on Scaleway Dedibox RPN
tags: dedibox jumbo frames jumbo-frames rpn mtu NFS
dates:
  validation: 2025-09-09
  posted: 2021-07-16
---

The RPN network supports by default jumbo frames. This allows you to configure your network interfaces with an MTU 9000 (Maximum transfer unit).

This technology allows you to significantly minimize the interruptions and processor latencies needed for data transfer. The performance gain can reach up to +20% on resource-intensive applications such as iSCSI, NFS, and DRDB.

## How to check your current MTU settings

1. To check your current MTU settings, type:
    ```
    ifconfig ethX | grep MTU
    ```

    <Message type="tip">
      Replace `ethX` with the name of your RPN interface.
    </Message>
2. An output like the following example displays:
    ```
    root@my-dedibox-server:~# ifconfig ethX | grep MTU
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
    ```

    In the example above you can see the current MTU of the network interface is set to the Ethernet standard of 1500.


## How to set the MTU 9000

### On Linux

#### CentOS

1. Open the file `/etc/sysconfig/network-scripts/ifcfg-ethX`, where `X` is the number of your interface, in a text editor. Then add the following line to it:
    ```
    MTU="9000"
    ```
2. Restart the network service:
    ```
    service network restart
    ```

#### Debian

1. Open the file `/etc/network/interfaces` in a text editor and insert `mtu 9000` below the line `iface ethX inet static`:
    ```
    auto ethX
    iface ethX inet static
    mtu 9000
    [...]
    ```
2. Restart the network service:
    ```
    service network restart
    ```

#### Ubuntu

1. Open the Netplan configuration file `/etc/netplan/01-netcfg.yaml` in a text editor and add the line `mtu: 9000` in the configuration of the RPN interface:
    ```
    ethernets:
        enp3s0:
            dhcp4: true
        enp4s0:
            addresses:
                - 192.168.0.10/24
            gateway4: 192.168.0.1
            mtu: 9000
            nameservers:
                addresses:
                    - 1.1.1.1
                    - 2.2.2.2
    ```
2. Save the file, exit the text editor, and reload the network configuration:
    ```
    sudo netplan apply
    ```

### On Windows

To change the MTU settings on Windows, you can use a tool like [TCP Optimizer](http://www.clubic.com/telecharger-fiche305576-tcp-optimizer.html) to modify the MTU settings.

1. Download and start the tool.
2. In the bottom right corner, click **Custom**.
3. Go to **Network adapter selection** and select the RPN interface.
4. Set the MTU value to `9000`.
5. Click on **Apply change** to update the MTU settings.