Centos 7 bind ничего не возвращает

Я попытался сделать DNS-сервер, но когда я делаю команду dig, сервер ничего не возвращает. У меня не было никакого предыдущего опыта, и я только следую этому учебнику: http://www.itzgeek.com/how-tos/linux/centos-how-tos/configure-dns-bind-server-on-centos-7-rhel-7.html.

файл named.conf:

//
// 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;192.168.38.103; };
        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; 192.168.38.0/24; };

        /*
         - 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 "dynavio.coop" IN {
        type master;
        file "fwd.dynavio.coop.db";
        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 "dynavio.coop" IN {
        type master;
        file "fwd.dynavio.coop.db";
        allow-update { none; };
};

zone "38.168.192.in-addr.arpa" IN {
        type master;
        file "38.168.192.db";
        allow-update { none; };
};

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

Файл fwd.dynavio.coop.db:

$TTL 86400
@   IN  SOA         primary.dynavio.coop. root.dynavio.coop. (
2014112511      ;Serial
3600            ;Refresh
1800            ;Retry
604800          ;Expire
86400           ;MinimumTTL
)
;Name Server Information
@       IN      NS primary.dynavio.coop.
;IP Address of Name Server
primary IN  A      192.168.38.8
;Mail exchanger
dynavio.coop.  IN  MX 10   mail.dynavio.coop.
;A - Record HostName To Ip Address
www     IN  A       192.168.38.100
mail    IN  A       192.168.38.150
;CNAME record
ftp     IN CNAME        www.dynavio.coop.

38.168.192.db файл:

$TTL 86400
@   IN  SOA         primary.dynavio.coop. root.dynavio.coop. (
2014112511      ;Serial
3600            ;Refresh
1800            ;Retry
604800          ;Expire
86400           ;Minimum TTL
)
;Name Server Information
@ IN  NS      primary.dynavio.coop.
;Reverse lookup for Name Server
8       IN   PTR     primary.dynavio.coop.
;PTR Record IP address to HostName
100     IN   PTR     www.dynavio.coop.
150     IN   PTR     mail.dynavio.coop.

Копать команду возвращает:

; <<>> DiG 9.9.4-RedHat-9.9.4-18.el7_1.5 <<>> www.dynavio.coop
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 43498
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;www.dynavio.coop.              IN      A

;; AUTHORITY SECTION:
coop.                   1272    IN      SOA     coop1.dyntld.net. support.nic.coop. 2015099691 900 1800 6048000 3600

;; Query time: 3 msec
;; SERVER: 192.168.38.1#53(192.168.38.1)
;; WHEN: Mon Dec 07 16:36:55 EET 2015
;; MSG SIZE  rcvd: 98

Обновление: похоже, проблема в /etc/resolv.conf перезаписывается каждый раз, когда сетевой менеджер перезапускается. Я обновлю это позже, когда смогу получить файл if-cfg.