====== DNS Master - Debian 7 ======
==== Pacotes necessários ====
<code bash>
root@ns1:~# apt-get install bind9 dnsutils
</code>

==== Configuração de zona ====
<code bash>
root@ns1:~# cat /etc/bind/named.conf.local 
//
// Do any local configuration here
//

// Consider adding the 1918 zones here, if they are not used in your
// organization
//include "/etc/bind/zones.rfc1918";

zone "exemplo.org" {
        type master;
        file "db.exemplo";
};
 
zone "2.0.192.in-addr.arpa" {
        type master;
        file "db.2.0.192";
};
</code>

==== Checando a configuração ====
<code bash>
root@ns1:~# named-checkconf 
root@ns1:~# named-checkconf -p
options {
	directory "/var/cache/bind";
	listen-on-v6 {
		"any";
	};
	auth-nxdomain no;
	dnssec-validation auto;
};
zone "exemplo.org" {
	type master;
	file "db.exemplo";
};
zone "2.0.192.in-addr.arpa" {
	type master;
	file "db.2.0.192";
};
zone "." {
	type hint;
	file "/etc/bind/db.root";
};
zone "localhost" {
	type master;
	file "/etc/bind/db.local";
};
zone "127.in-addr.arpa" {
	type master;
	file "/etc/bind/db.127";
};
zone "0.in-addr.arpa" {
	type master;
	file "/etc/bind/db.0";
};
zone "255.in-addr.arpa" {
	type master;
	file "/etc/bind/db.255";
};
</code>

==== Arquivo de zona ====
<code bash>
root@ns1:~# cat /var/cache/bind/db.exemplo
$TTL 86400 
@       IN      SOA     ns1.exemplo.org.  root.exemplo.org. ( 
                2016060101; serial 
                8h ; refresh 
                1h ; retry 
                3d ; expire 
                3h ) ; negative caching ttl 
;
@               IN              A       192.0.2.100 
@               IN              NS      ns1.exemplo.org.
@               IN              MX      10 mail.exemplo.org. 
;
ns1             IN              A       192.0.2.200
intranet	IN		A	192.0.2.100
webmail		IN		CNAME	intranet
ftp             IN              CNAME   intranet
mail            IN              A       192.0.2.240 
smtp            IN              CNAME   mail 
pop             IN              CNAME   mail 
imap            IN              CNAME   mail 
</code>

<code bash>
root@ns1:~# cat /var/cache/bind/db.2.0.192
$TTL 86400
@       IN      SOA     ns1.exemplo.org.  root.exemplo.org. ( 
                2016060101; serial 
                8h ; refresh 
                1h ; retry 
                3d ; expire 
                3h ); negative caching ttl 
; 
@               IN              NS      ns1.exemplo.org. 
;
200		IN		PTR	ns1.exemplo.org
240		IN		PTR	mail.exemplo.org
</code>

==== Checando as zonas ====
<code bash>
root@ns1:~# named-checkzone 2.0.192.in-addr.arpa /var/cache/bind/db.2.0.192 
zone 2.0.192.in-addr.arpa/IN: loaded serial 2016060101
OK
</code>

<code bash>
root@ns1:~# named-checkzone exemplo.org /var/cache/bind/db.exemplo 
zone exemplo.org/IN: loaded serial 2016060101
OK
</code>

<code bash>
root@ns1:~# echo "nameserver 127.0.0.1" > /etc/resolv.conf 
root@ns1:~# chattr +i /etc/resolv.conf
</code>

<code bash>
root@ns1:~# service bind9 restart
[ ok ] Stopping domain name service...: bind9.
[ ok ] Starting domain name service...: bind9.
</code>

<code bash>
root@ns1:~# dig -t SOA exemplo.org

; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> -t SOA exemplo.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56312
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;exemplo.org.			IN	SOA

;; ANSWER SECTION:
exemplo.org.		86400	IN	SOA	ns1.exemplo.org. root.exemplo.org. 2016060101 28800 3600 259200 10800

;; AUTHORITY SECTION:
exemplo.org.		86400	IN	NS	ns1.exemplo.org.

;; ADDITIONAL SECTION:
ns1.exemplo.org.	86400	IN	A	192.0.2.200

;; Query time: 30 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Jul  7 15:10:06 2016
;; MSG SIZE  rcvd: 104
</code>

<code bash>
root@ns1:~# host exemplo.org
exemplo.org has address 192.0.2.100
exemplo.org mail is handled by 10 mail.exemplo.org.
</code>

<code bash>
root@ns1:~# host intranet.exemplo.org
intranet.exemplo.org has address 192.0.2.100
</code>

<code bash>
root@ns1:~# host 192.0.2.200
200.2.0.192.in-addr.arpa domain name pointer ns1.exemplo.org.2.0.192.in-addr.arpa.
</code>