Calculate your IPv4 into a NAT64 synthesized IPv6 address:
Calculate IPv4 from synthesized NAT64 address:
Sample configurations for NAT64 & DNS64:
interface GigabitEthernet8 description To Internet ip address <ipv4 address & mask> no ip redirects no ip proxy-arp duplex auto speed auto nat64 enable ipv6 address FE80::2 link-local ipv6 address <your ipv6 address>/64 ipv6 enable ipv6 nd ra suppress all ! interface Vlan666 description IPv6 Only no ip address nat64 enable ipv6 address FE80::1 link-local ipv6 address <your ipv6 address>/64 ipv6 enable ipv6 nd autoconfig default-route ! ipv6 access-list NAT64 permit ipv6 <your ipv6 only subnet>::/64 64:FF9B::/96 ! nat64 v4 pool NAT64-IPv4 <v4 start & end addr.> nat64 v6v4 list NAT64 pool NAT64-IPv4 overload !
options { // other config snipped dns64 64:ff9b::/96 { clients { <your ipv6 only subnet>/64; }; }; };
Note: replace everything that is in between of "<" & ">".