FRITZ!Box 6820 LTE Service - Knowledge Base

FRITZ!Box 6820 LTE Service

Configuring a firewall for FRITZ!VPN

The FRITZ!VPN software allows you to establish a secure VPN (Virtual Private Network) connection over the Internet to your FRITZ!Box and then access all of the devices and services in the home network of your FRITZ!Box.

If the computer with FRITZ!VPN is protected by a firewall on the computer or upstream router, you may have to share the ports and IP protocols required by FRITZ!VPN before you can establish a VPN connection:

1 Configuring the firewall

The settings required for FRITZ!VPN are enabled in all FRITZ!Boxes by default and do not have to be configured manually. Make sure that any additional firewalls on the computer or an upstream router are also set up for FRITZ!VPN:

  • Configure the firewall according to the manufacturer's instructions so that it allows incoming and outgoing connections for the following ports and IP protocols:
    • ESP ("Encapsulated Security Payload"; IP protocol number 50)

      Note:In many routers, the option for enabling the ESP protocol is called "IPsec Passthrough".

    • UDP port 53 (DNS)
    • UDP port 500 (ISAKMP)
    • UDP port 4500 (NAT traversal)