Just the optics and nothing else. StormFiber switched to IPv6 2 years ago and there is hardly any advantage of using it over IPv4. In fact, IPv6 is more problematic than ipv4. Browsing slows down, and the majority of websites tend not to open on the first try. You can't connect VPN on IPv6, etc.So according to ProPakistani, PTA has instructed all telecom operators and ISPs to switch to IPv6 as soon as possible.