Wrapsix(NAT64) not working in R8000 router

I am working Netgear R8000 router.To that router i connected one ipv6 cable and one more 3G modem.
Both are connected successfully.When i connected from my system to that wifi through TCP/IPv4 and TCP/IPv6 all sites are working properly,but when i connected to through only TCP/IPv6 only IPv6 websites are opening,IPv4 website's not
opening,for that purpose i am running Wrapsix(NAT64) but still i am unable to connect IPv4 Websites.

please anyone can help?