FRITZ!Box 6490 Cable Service - Knowledge Base
- FRITZ!Box 7590
- FRITZ!Box 7581
- FRITZ!Box 7560
- FRITZ!Box 7530
- FRITZ!Box 7490
- FRITZ!Box 7430
- FRITZ!Box 7390
- FRITZ!Box 7369
- FRITZ!Box 7360
- FRITZ!Box 7340
- FRITZ!Box 7330
- FRITZ!Box 7272
- FRITZ!Box 6890 LTE
- FRITZ!Box 6840 LTE
- FRITZ!Box 6820 LTE
- FRITZ!Box 6810 LTE
- FRITZ!Box 6591 Cable
- FRITZ!Box 6590 Cable
- FRITZ!Box 5491
- FRITZ!Box 5490
Security functions (firewall) of the FRITZ!Box
The FRITZ!Box offers a completely closed firewall to protect against unwanted data from the internet. In the factory settings, all of the computers, smartphones, and other devices connected to the FRITZ!Box are already completely protected against attacks from the internet.
The FRITZ!Box's firewall provides the following security functions:
- No devices in the home network are visible on the internet, which means that it is not possible to access them directly over the internet. IP Masquerading or Network Address Translation (NAT) ensures this on the TCP/IP level.
- The FRITZ!Box checks all incoming and outgoing data packets and automatically rejects unwanted data from the internet (Stateful Packet Inspection). This way only data packets that are direct replies to previous requests reach the home network.
- By default, all TCP and UDP ports are either closed for incoming connections from the internet or completely concealed. Therefore, so-called "portscans" cannot find any open TCP or UDP ports that could indicate weak points for potential attacks from "hackers".
- The FRITZ!Box uses packet filters to prevent data packets (such as NetBIOS) containing information about devices in the home network from reaching the internet.
If you want to access web servers or VPN servers, online games, and other applications from the internet, you can set up port sharing for specific ports.
You can find an overview of opened ports and active packet filters under "Diagnostics > Security" in the FRITZ!Box user interface.