Файл зоны обратного подчиненного DNS-сервера не передан

Я использую бесплатный уровень Amazon с RHEL 7 и настраиваю главный и подчиненный DNS-серверы. С мастером все в порядке, но с ведомым я не нашел результата. Также я хотел бы знать, как я могу защитить свой DNS-сервер.

На подчиненном сервере файл /etc/ named.conf:

options {
listen-on port 53 { 127.0.0.1; 52.34.228.106; 0.0.0.0/0; };
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; 0.0.0.0/0; };
/*
- If you are building an AUTHORITATIVE DNS server, do NOT enable recurs ion.
- If you are building a RECURSIVE (caching) DNS server, you need to ena ble
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 w ill
cause your server to become part of large scale DNS amplification
attacks. Implementing BCP38 within your network would greatly
reduce such attack surface
*/
#options{
recursion yes;
# allow-recursion { trusted;};
#};

dnssec-enable yes;
dnssec-validation yes;

/* 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";
};

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

и файл /etc/rfc1912.zones:

zone "iftibd.com" IN {
type slave;
file "slaves/seobd.fz";
masters { 52.37.252.202;};
allow-notify {52.37.252.202; };
};

zone "228.34.52.in-addr.arpa" IN {
type slave;
file "slaves/seobd.rz";
masters { 52.37.252.202;};
allow-notify {52.37.252.202;};
};



   [root@ip-172-31-17-202 slaves]# nslookup iftibd.com
    Server: 52.34.228.106
    Address: 52.34.228.106#53

Name: iftibd.com
Address: 52.37.252.202
Name: iftibd.com
Address: 52.34.228.106

[root@ip-172-31-17-202 slaves]# nslookup 52.34.228.106
Server: 52.34.228.106
Address: 52.34.228.106#53

** server can't find 106.228.34.52.in-addr.arpa: SERVFAIL

Я обнаружил, что только seobd.fz создана, но не создана обратная зона.