when i check resolver.log just now , i found some error info about AAAA ( ipv6)

[Barry Margolin]

In article <mailman.548.1460561615.73610.bind-users at lists.isc.org>,
 "Darcy Kevin (FCA)" <kevin.darcy at fcagroup.com> wrote:

> Really, there's no excuse, in this day and age, for a DNS-serving device -- 
> even a load-balancer pretending to be a nameserver -- to botch its responses 
> to AAAA queries.

Load balancers routinely botch requests for any type other than the 
specific type they're programmed to balance. There's never been an 
excuse for it in the first place (how hard would it have been for them 
to return NOERROR?), so there's no reason to expect them to treat AAAA 
any differently from other types that they don't know about.

-- 
Barry Margolin
Arlington, MA