[CentOS] IPV6 and DNS...

Hi,

I keep getting entries like these in my logs:

  network unreachable resolving '0.centos.pool.ntp.org/AAAA/IN': 2001:500:40::1#53: 1 Time(s)
  network unreachable resolving '0.centos.pool.ntp.org/AAAA/IN': 2001:500:e::1#53: 1 Time(s)
  network unreachable resolving '0.centos.pool.ntp.org/AAAA/IN': 2001:dc3::35#53: 1 Time(s)

I don't see any IPV6 parameters to disable in named.conf, apart from the 'listen-on-v6' 
which I commented, and the 'query-source-v6' which is commented by default...
I disabled IPV6 in the sysconfig files; but not in the modprobe.conf though...
Can I just ignore these "errors"?

Thx,
JD