Помогите разобраться с DNS

options {
        listen-on port 53 { 127.0.0.1;192.168.0.254; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        allow-query     {trusted-networks;};
        recursion no;

        };

//controls {
// inet 127.0.0.1 allow { localhost; } keys { rndc_key; };
// };

logging {
        channel default_debug {
                file "data/named.run";
                severity debug 3;
               print-category yes;
                 print-time yes;
        };
};


acl "trusted-networks" {localhost; 192.168.0.0/24;};

zone "cloud.stack" IN   {
        type master;
        file "cloud.stack";
};

zone "168.192.in-addr.arpa" {
       type master;
       file "192.168.rev";
};

include "/etc/named.rfc1912.zones";

$TTL 86400
$ORIGIN cloud.stack.
@ IN SOA cloud.stack. support.cloud.stack. ( 2012061101 ; serial
                                                28800 ;refresh
                                                7200  ;retry
                                                604800  ;expire
                                                86400 ; ttl
                                               )

@            IN  NS       ns1.cloud.stack.
@            IN  A         192.168.0.254
ns1         IN   A 192.168.0.254
@           IN   MX 10 mail.cloud.stack.
mail       IN    A 192.168.0.254
repo      IN    A 192.168.0.250

$TTL 86400
@ IN SOA cloud.stack. support.cloud.stack. ( 1 ; serial
                                                28800 ;refresh
                                                7200  ;retry
                                                604800  ;expire
                                                86400 ; ttl
                                               )

@           IN        NS ns1.cloud.stack.
0.254     IN        PTR cloud.stack.
0.250     IN        PTR repo.cloud.stack.

[root@repo /]# nslookup  192.168.0.250
Server:		192.168.0.254
Address:	192.168.0.254#53

** server can't find 250.0.168.192.in-addr.arpa.: NXDOMAIN