Thus spake "Randy Bush" <randy@psg.com>
small site. so public servers provide multiple and diverse services. if a hostname has a v6 address, then all services must be v6 capable because clients do not retry the A record.
This seems to argue for having "service" hostnames, which has been standard practice at many sites for a long, long time. For instance, if you have a single box which does mail and news, and you have v6 mail but only v4 news, then mail.example.com should have both A and AAAA records but news.example.com should have A records only. (Yes, this means you can't just CNAME the service hostname to the real hostname, but there are several other strategies.) S Stephen Sprunk "Those people who think they know everything CCIE #3723 are a great annoyance to those of us who do." K5SSS --Isaac Asimov