---
title: "Activate IP filters (Firewall) - IT Security"
slug: "it-security-hardening-activate-ip-filters-firewall-en"
updated: 2024-10-02T08:37:14Z
published: 2024-10-02T08:37:14Z
canonical: "docs.insys-icom.com/it-security-hardening-activate-ip-filters-firewall-en"
---

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

# Activate IP filters (Firewall) - IT Security

The IP filters act as firewall following the white list principle, i.e. all data packets are blocked unless they are explicitly permitted here.

1. Click in the ![lan](https://docs.insys-icom.de/assets/icons/lan.png) *Network* → *Firewall / NAT* menu in the *Firewall* section on ![pencil](https://docs.insys-icom.de/assets/icons/pencil.png) and check the checkbox *IP filter for IPv4 activated*.
2. Click on **SUBMIT** .
3. Click on **ACTIVATE PROFILE** **![cog white](https://docs.insys-icom.de/assets/icons/cog_white.png)** .

> [!NOTE]
> Please note!
> 
> It is recommended to check all existing filter rules for their necessity and [Restrict or deactivate IP Filter (Firewall) Rules](/kb/docs/en/it-security-hardening-restrict-or-deactivate-ip-filter-firewall-rules-en) them further, if applicable.