$TTL 3D
@       IN     SOA     centos.fenestros.loc. root.centos.fenestros.loc. (
               2012120301       ; Serial
               8H   ; Refresh
               2H   ; Retry
               4W  ; Expire
               1D)  ; Minimum TTL
               IN      NS      centos.fenestros.loc.
localhost                   A              127.0.0.1
dnsmaster                   IN      CNAME  centos.fenestros.loc.
centos.fenestros.loc.       IN      A      10.0.2.15

ftp IN CNAME centos.fenestros.loc.
www IN CNAME centos.fenestros.loc.
mail IN CNAME centos.fenestros.loc.
news IN CNAME centos.fenestros.loc.