# Executing custom gateway commands

Defguard gateway has ability to execute custom commands before and after the WireGuard tunnel us up or down.

{% hint style="warning" %}
If you want to run a shell script, you should pass it's path to your shell, for example:

`/bin/sh -c /path/to/script`
{% endhint %}

You can use this functionality in various ways:

#### ENV Variables

* `PRE_UP` - Command to run before bringing up the interface.
* `POST_UP` - Command to run after bringing up the interface.
* `PRE_DOWN` - Command to run before bringing down the interface.
* `POST_DOWN` - Command to run after bringing down the interface.

#### Command line arguments

* `--pre-up` - Command to run before bringing up the interface.
* `--post-up` - Command to run after bringing up the interface.
* `--pre-down` - Command to run before bringing down the interface.
* `--post-down` - Command to run after bringing down the interface.

#### /etc/defguard/gateway.toml - configuration file entries

* `pre-up` - Command to run before bringing up the interface.
* `post-up` - Command to run after bringing up the interface.
* `pre-down` - Command to run before bringing down the interface.
* `post-down` - Command to run after bringing down the interface.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.defguard.net/1.4/features/wireguard/executing-custom-gateway-commands.md?ask=<question>
```

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The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.