declaracion de zona y soa example.proxy

###### named.conf.local

zone "example.proxy" {
    type master;
    file "/etc/bind/db.example.proxy";
};

##### db.example.proxy

$TTL 1D
$ORIGIN example.proxy.

@ IN SOA ns1.example.proxy. admin.example.proxy. (
        1       ; Serial
        8H      ; Refresh
        2H      ; Retry
        4W      ; Expire
        1D      ; Minimum TTL
)

@       IN      NS      ns1.example.proxy.

; 192.168.11.220 direccion IP del servidor web
@       IN      A       192.168.11.220

; Dirección IP del servidor DNS
ns1     IN      A       192.168.11.210