مشکل با dns

[zeperto]

من الان می خوام dns رو درست کنم.ns1 رو راه انداختم و وقتی با nslookup دامینم رو می زنم جواب میده ولی فقط برای یه dns یعنی فقط ns1.mydomain.com ست شده
وقتی می خوام ns2 رو درست کنم (از روی این آموزش کار رو تا اینجا انجام دادم).فایل named.conf رو ویرایش می کنم با مقدارهای زیر.

[CODE]
//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
        listen-on port 53 { 127.0.0.1; 78.46.***.***;};
        listen-on-v6 port 53 { ::1; };
        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     { localhost; 78.46.***.***; };

        /*
         - If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.
         - If you are building a RECURSIVE (caching) DNS server, you need to enable
           recursion.
         - If your recursive DNS server has a public IP address, you MUST enable access
           control to limit queries to your legitimate users. Failing to do so will
           cause your server to become part of large scale DNS amplification
           attacks. Implementing BCP38 within your network would greatly
           reduce such attack surface
        */
        recursion yes;

        dnssec-enable yes;
        dnssec-validation yes;
        dnssec-lookaside auto;

        /* Path to ISC DLV key */
        bindkeys-file "/etc/named.iscdlv.key";

        managed-keys-directory "/var/named/dynamic";

        pid-file "/run/named/named.pid";
        session-keyfile "/run/named/session.key";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};
zone "mydomain.com" IN {

type slave;
file "slaves/mydomain.fwd";
masters { 78.46.***.***; };
};
zone "1.168.192.in-addr.arpa" IN {
type slave;
file "slaves/mydomain.rev";
masters { 78.46.***.***; };
};

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


[/CODE] 

بعد از ویرایش فایل و ذخیره 2 تا دستور زیر رو می زنم ولی هیچ فایلی در مسیر /var/named/slaves ساخته نمیشه.
systemctl enable named
systemctl start named
کسی می دونه مشکلش از کجاست؟ راهنمایی کنید لطفا

ضمنا وقتی دستور tail /var/log/messages رو می زنم خطهای زیر ظاهرا ارور نشون میدن

May 30 16:47:54 mydomain named[2184]: zone mydomain.com/IN: refresh: unexpected rcode (SERVFAIL) from master 78.46.***.***#53 (source 0.0.0.0#0)
May 30 16:47:54 hesabchi named[2184]: zone 1.168.192.in-addr.arpa/IN: refresh: unexpected rcode (SERVFAIL) from master 78.46.***.***#53 (source 0.0.0.0#0)

ممنون