>http://www.ripe.net/rs/reverse/reverse_howto.html

обратная зона не работает =( ripe говорит:

***Info: Authorisation for parent [inetnum] x.y.z1.0 - x.y.z4.255 using mnt-domains: authenticated by: MNT-МОЙМНТ
***RDNS: (related to ns.myanotherdomain.ru) INFO: The checker encountered an error when looking up SOA records for the name z4.y.x.in-addr.arpa at x.y.z4.253: SERVFAIL
***RDNS: (related to ns.myanotherdomain.ru) INFO: The checker encountered an error when looking up NS records for the name z4.y.x.in-addr.arpa at x.y.z4.253: SERVFAIL
***RDNS: (related to ns.myanotherdomain.ru) ERROR (20 points): Could not get an SOA record from ns.myanotherdomain.ru (x.y.z4.253).
***RDNS: (related to ns2.myanotherdomain.ru) INFO: The checker encountered an error when looking up SOA records for the name z4.y.x.in-addr.arpa at x.y.z4.254: SERVFAIL
***RDNS: (related to ns2.myanotherdomain.ru) INFO: The checker encountered an error when looking up NS records for the name z4.y.x.in-addr.arpa at x.y.z4.254: SERVFAIL
***RDNS: (related to ns2.myanotherdomain.ru) ERROR (20 points): Could not get an SOA record from ns.myanotherdomain.ru (x.y.z4.254).
***RDNS: (related to set) INFO: The delegated nameservers ns.myanotherdomain.ru (x.y.z4.253) and ns2.myanotherdomain.ru (x.y.z4.254) may not be on the same subnet.
***Error: There are 20 or more problem points. Delegation was not successful.

***Error: RDNS Authorisation failed

текущие конфиги

------------------------------------view named.conf
// OPTIONS
options {
        directory       "/etc/namedb/";
        pid-file        "/var/run/named/pid";
        dump-file       "/var/dump/named_dump.db";
        statistics-file "/var/stats/named.stats";

        listen-on {
            127.0.0.1;
            x.y.z4.253;
            192.168.1.254;
        };

        forwarders {
            x.y.z.f;  ip провайдера
            127.0.0.1;
        };

};

// ZONES
zone "." {
        type hint;
        file "named.root";
};

zone "0.0.127.IN-ADDR.ARPA" {
        type master;
        file "master/localhost.rev";
};

zone "z4.y.x.IN-ADDR.ARPA" {
        type master;
        file "master/mydomain.ru-reverse";
};

zone "another mydomain.ru " {
        type master;
        file "master/anothermydomain.ru ";
};

zone " mydomain.ru " {
        type master;
        file "master/mydomain.ru ";
};
------------------------------------view  mydomain.ru-reverse

Z4.y.x.in-addr.arpa IN SOA ns. another mydomain.ru.  xxx. mydomain.ru. (
2007113000 ; Serial
10800 ; Refresh
3600 ; Retry
1209600 ; Expire
10800 ) ; Minimum TTL

; DNS Servers
IN NS ns. another mydomain.ru.
IN NS ns2. another mydomain.ru.
253 IN PTR mydomain.ru.

------------------------------------view  mydomain.ru

$TTL 3600

mydomain.ru. IN SOA ns. another mydomain.ru .  xxx. mydomain.ru. (
2007113000 ; Serial
10800 ; Refresh
3600 ; Retry
1209600 ; Expire
10800 ) ; Minimum TTL

; DNS Servers
@ IN NS ns. another mydomain.ru .
@ IN NS ns2.another mydomain.ru .

; Machine Names
localhost       IN A    127.0.0.1
@               IN A    x.y.z4.253

; MTAs
;@               IN MX 10 @
@               IN MX 10 mydomain.ru .

; Aliases
www             IN A x.y.z4.254
mydomain.ru .   IN A x.y.z4.253
ftp             IN A x.y.z4.254

------------------------------------view  another mydomain.ru

$TTL 3600

another mydomain.ru . IN SOA ns. another mydomain.ru . xxx. mydomain.ru. (
2007113000 ; Serial
10800 ; Refresh
3600 ; Retry
1209600 ; Expire
10800 ) ; Minimum TTL

; DNS Servers
@ IN NS ns. another mydomain.ru .
@ IN NS ns2. another mydomain.ru .
; Machine Names
localhost       IN A    127.0.0.1
@               IN A    x.y.z4.253
ns              IN A    x.y.z4.253
ns2             IN A    x.y.z4.254

; MTAs
@               IN MX 10 @
www             IN A x.y.z.f
ftp             IN A x.y.z.f

------------------------------------------------------- результат с x.y.z4.253

nslookup another mydomain.ru
Server:         127.0.0.1
Address:        127.0.0.1#53

Name:   another mydomain.ru
Address: x.y.z4.253

nslookup mydomain.ru
Server:         127.0.0.1
Address:        127.0.0.1#53

Name:   mydomain.ru
Address: x.y.z4.253

nslookup x.y.z4.253
Server:         127.0.0.1
Address:        127.0.0.1#53

** server can't find 253.z4.y.x.in-addr.arpa: SERVFAIL

почему так?