Thanks guys for your reply.
bendsley, I'm having a small IPv6 network for experimental purposes and I want test my old IPv4 router to see how it performs.
I have read within some routers manufacturers websites (like Sitecom) that their routers will support IPv6 with firmware update, which makes me wonder, does IPv6 support a require some hardware to be available within the router or it is a software thing which can be enabled/activated with proper firmware
Kindly advice