IPv6

Internet / Account Information / IPv6

The FRITZ!Box supports connecting to the IPv6 range of the internet. If you would like to allow IPv6 connections, switch on the IPv6 connection of the FRITZ!Box on this page. Make sure that the computers in the FRITZ!Box network are also configured for connecting to IPv6. For modern operating systems no manual configuration is necessary; IPv6 support is configured automatically (for instance in the Windows operating systems Vista and higher).
The FRITZ!Box supports dual-stack and dual-stack lite for simultaneous use of IPv6 and IPv4, which means that the FRITZ!Box can establish both IPv4 and IPv6 connections.

A short introduction on the subject of IPv6 is available here: IPv6: Introduction.

Click the "Apply" button to save your settings. If you leave the page without saving, all of your changes will be discarded.

IPv6 Support

IPv6 support enabled

This setting enables IPv6 support in the FRITZ!Box.

IPv6 Connectivity

The FRITZ!Box differentiates between two kinds of IPv6 connections: Native IPv6 and IPv6 with a tunnel protocol.

Native IPv6 Native IPv6 means that your internet service provider supports IPv6 directly on your line, so that IPv6 connections are possible without using a tunnel protocol.
IPv6 with a tunnel protocol An IPv4 connection is used to transport IPv6 packets. This is done by packing (tunneling) IPv6 packets into IPv4 packets. Using a tunnel protocol the IPv6 range of the internet can be reached even if your internet service provider does not support IPv6.

Find out whether your internet service provider supports IPv6 on your line. Decide then how you want to use IPv6.

 

Use native IPv4 connection

Select this setting if IPv4 is supported on your internet connection. Also select this setting if both IPv4 and IPv6 are supported on your internet connection.

IPv4 and IPv6 connections are negotiated as follows:

  • First a native IPv4 connection is established.
  • If the FRITZ!Box has acquired the address of a 6RD server via DHCPv4, a 6RD tunnel is established for the IPv6 connection.
  • If the FRITZ!Box has not received the address of a 6RD server, the FRITZ!Box attempts to use Dual-Stack to establish a native IPv6 connection.
  • If neither a 6RD tunnel nor a native IPv6 connection is achieved, then no IPv6 connections are possible.

 

Use native IPv6 connection

Select this setting only if your internet service provider supports IPv6 on your line. If your IPv6 is not supported on your line and you selected this setting, then only IPv4 connections and no IPv6 connections will be established.

 

Establish IPv4 connection via DS Lite

Enable this setting if your Internet provider supports DS-Lite (dual stack lite) and the IPv4 connection is to be established via DS-Lite.

Dual Stack Lite is a method in which IPv4 packets are tunneled in IPv6 packets. The tunneled packets are sent to the AFTR server (Address Family Transition Router) at the Internet service provider. The AFTR server forwards the IPv4 packets to the IPv4 area of the Internet. In this case NAT (Network Address Translation) does not take place in the FRITZ!Box, but in the AFTR server.

Determine AFTR address automatically over DHCPv6: Select this setting if you do not know the address of the AFTR server.

Define AFTR address: Select this setting if you know the address of the AFTR server. Enter either the IPv6 address or the complete domain name (FQDN, Fully Qualified Domain Name).

If you enabled the setting "Establish IPv4 connection via DS Lite", the IPv6 connection will be established as a native connection and the IPv4 connection over DS-Lite.

If you did not enable the setting "Establish IPv4 connection via DS Lite", the IPv4 and the IPv6 connections will be established as follows:

  • First a native IPv6 connection is established.
  • If the FRITZ!Box has acquired an AFTR address via DHCPv6, Dual-Stack Lite is used for the IPv4 connection.
  • If no AFTR address was acquired and it was not possible to establish the native IPv6 connection, a native IPv4 connection will be established.

Configure the additional settings in the "Connection Settings" area. More information on these settings is presented here: Connection Settings.

Use IPv6 with a tunnel protocol

Select this option if IPv6 is not supported on your line. You can select among various tunnel protocols.

Select a tunnel protocol from the "Connection Settings" area. More information on these settings is presented here: Connection Settings.

 

Additional Settings

MTU Settings

MTU stands for Maximum Transfer Unit. This value is generally determined automatically. For diagnostic purposes it may make sense to change this value manually.