12.5.4. IP version 6

BIND version 9 supports name service in IP version 6 (IPv6) environments through the use of A6 zone records.
If the network environment includes both IPv4 and IPv6 hosts, use the lwresd lightweight resolver daemon on all network clients. This daemon is a very efficient, caching-only nameserver which understands the new A6 and DNAME records used under IPv6. Refer to the lwresd man page for more information.