[mzltest]

As a general Notes about IPv6 and according to inventors, the IPv6 is necessary due to growing numbers of connecting devices globally. but still what i see IPv4 is also compulsory while connecting however we enable ipv6 availability. it's mean out device has two addresses?

I think this happens because we still have ipv4 resources.We are still not to the point that we can only allocate ipv6 resources to new devices and there are already solutions to the probable lack of ipv4(NAT,etc.)I have heard the news that a continent have used up their ipv4 addresses,but still we have many address available.It is not something that like ipv6 that can give for free(like these cheap or free ipv6 only vpses),but we still can allocate one for some price(probably included in your product).

So yes,we have two addresses now and maybe years later the existing devices still have two but new devices only have one - but it would really take a long time.