I am not familiar with IPv6, hence the question: if a client computer has IPv6 stack available but does not acquire IPv6 ip from ISP (as most modern computers in Taiwan do), will it be able to send and receive NTP packets to and from pool servers with AAAA addresses?
Image from [Google IPv6 survey] (https://www.google.com/intl/en/ipv6/statistics.html#tab=per-country-ipv6-adoption&tab=per-country-ipv6-adoption)