You may get logs similar to the following:
Sep 17 16:15:07 nsserver named[21089]: network unreachable resolving
'ns2.vistaprint.com/A/IN': 2001:503:a83e::2:30#53
You can specify OPTIONS=’-4′ in /etc/sysconfig/named to tell named not to use IPv6 or disable IPv6 completely on your machine. You can disable IPv6 this way:
Add
“options ipv6 disable=1” to /etc/modprobe.conf
and
“NETWORKING_IPV6=no” to /etc/sysconfig/network