cache only name server

[sysadmin at hostalia.com]

Hi!!!

 I have installed bind (as cache only server) and it works enough good
but often when a zone changes the bind shows the old zone value and i
must reload the bind server so bind shows the correct zone value.

this is my configuration:

options {
        directory "/var/named";
        allow-query { any; };
        allow-transfer { none; };
        allow-recursion { any; };
        notify no;
        recursive-clients 1500;
        listen-on { IP; };
        pid-file "/var/run/named.pid";
// 
        auth-nxdomain no;    # conform to RFC1035
};
zone "." {
        type hint;
        file "db.root";
};


 I have put this options but the result is the same:

      max-cache-ttl 1800;
      max-ncache-ttl 1800;
      max-cache-size 100k;

What have I to do to prevent bind from showing the old zone value?


 Thanks in advance.