Google currently gets 9% of their traffic over IPv6: https://www.google.com/intl/en/ipv6/statistics.html https://www.google.com/intl/en/ipv6/statistics.html I

Google currently gets 9% of their traffic over IPv6: https://www.google.com/intl/en/ipv6/statistics.html https://www.google.com/intl/en/ipv6/statistics.html IPv6 adoption is already at the point where it is relevant to your security checks. If IPv6 clients are exempt from your security, that is a problem right now.