understand ipv6 is supported in 7.3 onwards. there is a document mentioned about the deployment type as below
endpoint use ipv6 and SA interface use ipv4 ISP Connectivity is transition mechanism
Description of connection:
¥An IPv6 endpoint can connect to the IPv4 host through a NAT-PT, NAT64, or DS-Lite transition mechanism. See Network Address TranslationÓ on the Juniper Networks website for a description of NAT transition mechanisms supported on Junos OS routing platforms. ¥ You must implement DNS64 to resolve the Secure Access Service hostname to an IPv6-mapped IPv4 address.
my question here is does this type deployment method only working if SA box running 7.3 which is IPv6 supported? the reason i am asking is because there's no configuration change on this deployment type so i just wondering whether ive os before 7.3 support this kind of deployment method or not.