[CentOS] resolving names it is really slow slow with CentOS5.x using named

Hi all,

I have a problem using named with different CentOS5 servers (2 servers): all they are really slow to resolv any internet address and most of time fails to resolv. This situation differs if I use "forwarders" servers like opendns: resolving names it is really really quickly. And I don't understand why.

On the other hand I have tested three DNS servers using Windows 2003, Windows 2008 and Ubuntu hardy and these problems doesn't occurs (I don't need to configure forwarders on any of them): all resolves any name and really fast.

IPv6 is disabled on both CentOS servers. Somebody knows why these dns servers are slow??

Thanks.