Ipv6 ip addresses and Named problem

[inado1]

I have a server with IPV4 and for some reasons when i go to /var/log/messages i get lots of errors from named (bind) that try resolving Ipv6 ips.

Feb 16 05:12:39 hb2074 named[1893]: error (network unreachable) resolving 'ns1.on.net/A/IN': 2001:44b8:8020:ff00::80#53
Feb 16 05:12:39 hb2074 named[1893]: error (network unreachable) resolving 'ns4.on.net/A/IN': 2001:44b8:8020:ff00::80#53
Feb 16 05:12:39 hb2074 named[1893]: error (network unreachable) resolving 'ns1.on.net/AAAA/IN': 2001:44b8:8020:ff00::80#53
Feb 16 05:12:39 hb2074 named[1893]: error (network unreachable) resolving 'ns2.on.net.au/AAAA/IN': 2001:dc0:4001:1:0:1836:0:141#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns2.he.net/AAAA/IN': 2001:470:300::2#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns2.he.net/A/IN': 2001:470:300::2#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns1.he.net/AAAA/IN': 2001:470:300::2#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns1.he.net/A/IN': 2001:470:300::2#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns2.he.net/AAAA/IN': 2001:470:500::2#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns2.he.net/A/IN': 2001:470:500::2#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns1.he.net/AAAA/IN': 2001:470:500::2#53
Feb 16 05:33:20 hb2074 named[1893]: error (network unreachable) resolving 'ns1.he.net/A/IN': 2001:470:500::2#53
Feb 16 05:46:16 hb2074 named[1893]: error (network unreachable) resolving 'sns-pb.isc.org/A/IN': 2001:500:e::1#53
Feb 16 05:46:16 hb2074 named[1893]: error (network unreachable) resolving 'sns-pb.isc.org/AAAA/IN': 2001:500:e::1#53
Feb 16 05:46:16 hb2074 named[1893]: error (network unreachable) resolving 'sns-pb.isc.org/A/IN': 2001:500:71::30#53
Feb 16 05:46:16 hb2074 named[1893]: error (network unreachable) resolving 'sns-pb.isc.org/AAAA/IN': 2001:500:71::30#53
Feb 16 05:46:16 hb2074 named[1893]: error (network unreachable) resolving 'sns-pb.isc.org/A/IN': 2001:500:60::30#53
Feb 16 05:46:16 hb2074 named[1893]: error (network unreachable) resolving 'sns-pb.isc.org/AAAA/IN': 2001:500:60::30#53

In order to fix that, i went to /etc/sysconfig/named and i added a -4 to the list of parameter
OPTIONS="-c /etc/named.conf -u named -n 2 -4" to force Bind to only listen on IPV4 addresses.

Nevertheless, at the next upgrade i wonder if it will be overwritten.

Thank you.