how to reduce unnecessary lots of AAAA queries?

[MontyRee]

Hello, all.


I have operated some centos 5.3 (x86_64) linux servers.
when I tcpdump the dns query, I can see lots of AAA queries from my linux servers.
and ServFail response from DNS server. 

surely, I don't use ipv6 and "NETWORKING_IPV6=no" was configured at /etc/sysconfig/network file.

How to reduce(or stop) unnecessary lots of AAAA queries?


Thank you!