Use native IPv4 connection: Connection Settings
Use DHCPv6 Rapid Commit
"Use DHCPv6 Rapid Commit" is enabled in the settings preconfigured for the FRITZ!Box.
DHCPv6 Rapid Commit is an abridged procedure for negotiating the IPv6 parameters transmitted via DHCPv6. Negotiation takes place between the DHCPv6 server (internet provider) and the DHCPv6 client (FRITZ!Box). Four messages are exchanged in the non-abridged procedure. In DHCPv6 Rapid Commit only two messages are exchanged (solicit and reply).
When "Use DHCPv6 Rapid Commit" is enabled, this procedure is used if it is supported by the internet provider. If the internet provider does not support the procedure, the non-abridged procedure is used.
Require certain length for the LAN prefix
You can require a certain length for the LAN prefix. The LAN prefix may not be longer than 64 bits.