Is there any service which I will not be able to use by connecting with IPv6?
A
IPv6 Connection (IPoE) will not affect the use of other services.
If there is any service you cannot use by any chance, please try to reboot your device or update your firmware.
With IPv4 over IPv6 Connection (DS-Lite), Fixed IP Address Option and Pre-Allocation of Fixed IP Address provided with PPPoE IPv4 connection are not available.
IP-Phone-C is not also available due to its service specification.