# ip mtu

## Syntax

```
ip mtu <n>
```

## Syntax Description

<table><thead><tr><th width="203">Keyword</th><th>Description</th></tr></thead><tbody><tr><td>n</td><td>The MTU size in bytes.</td></tr></tbody></table>

## Defaults

The default MTU is 1,500 bytes for Ethernet interfaces and 1,408 bytes for WireGuard VPN interfaces.

## Usage Guidelines

This command sets the maximum transmission unit (MTU) for an interface.

This command is valid only in interface context. Entering it does not change the [configuration mode](https://docs.islandrouter.com/island-router-cli-2.3.2/commands/ip-interface-context/ip-autoconfig) of the interface.

## Examples

```
ip mtu 1300
```

## Related Commands

{% content-ref url="../interface" %}
[interface](https://docs.islandrouter.com/island-router-cli-2.3.2/commands/interface)
{% endcontent-ref %}