Is my DNS set up properly for reverse lookups?

Tim Lanza Tim at Lanzahost.com
Thu Jun 24 03:08:17 UTC 1999


I've configured a linux 5.2 server for DNS with service for 2 domain names
(firstdomain.com and seconddomain.com).  Both are registered to the same
address (111.222.333.444 in this example).  Everything seems to be working
fine, but I'm wondering if it's set-up properly.  In particular, I'm not
sure about the reverse lookups.  It seems incorrect that named.conf would
have two zone names that are the same (333.222.111.in-addr.arpa), one
references file firstdomain.rev file, the other references file
seconddomain.rev.  The .rev files, in turn, point to the same IP address.
Example files are included for reference (sorry for the length).  Is this
set-up correct?

TIA for any advice!

Tim
tjlanza at west.raytheon.com


######################
 /etc/named.conf file
######################

// generated by named-bootconf.pl

options {
 directory "/var/named";
 /*
  * If there is a firewall between you and nameservers you want
  * to talk to, you might need to uncomment the query-source
  * directive below.  Previous versions of BIND always asked
  * questions using port 53, but BIND 8.1 uses an unprivileged
  * port by default.
  */
 // query-source address * port 53;
};

//
// a caching only nameserver config
//
zone "." {
 type hint;
 file "named.ca";
};

zone "0.0.127.in-addr.arpa" {
 type master;
 file "localhost.rev";
};

zone "firstdomain.com" {
 notify no;
 type master;
 file "lanzahost.db";
};

zone "333.222.111.in-addr.arpa" {
 notify no;
 type master;
 file "firstdomain.rev";
};

zone "seconddomain.com" {
        notify no;
        type master;
        file "seconddomain.db";
};

zone "333.222.111.in-addr.arpa" {
 notify no;
 type master;
 file "seconddomain.rev";
};


#######################
 /etc/resolv.conf file
#######################

search firstdomain.com
nameserver 127.0.0.1


################################
 /var/named/firstdomain.db file
################################

@       IN      SOA     firstdomain.com. hostmaster.firstdomain.com.  (
                                      1999050900 ; Serial
                                      8H      ; Refresh
                                      2H      ; Retry
                                      1W      ; Expire
                                      1D )    ; Minimum
  TXT "firstdomain.com, The Internet Specialists"

  NS foo.firstdomain.com.
  MX 10 mail

localhost A 127.0.0.1

foo  A 111.222.333.444
  MX 10 mail
  HINFO "Name Server" "Linux 5.2"

www  CNAME foo.firstdomain.com.
  MX 10 mail
  HINFO "WWW Server" "Linux 5.2"


#################################
 /var/named/seconddomain.db file
#################################

@       IN      SOA seconddomain.com. hostmaster.seconddomain.com. (
                                      1999050900 ; Serial
                                      8H      ; Refresh
                                      2H      ; Retry
                                      1W      ; Expire
                                      1D )    ; Minimum
  TXT "seconddomain.com, The Internet Specialists"

  NS foo.firstdomain.com.
  MX 10 mail

www  CNAME foo.firstdomain.com.
  MX 10 mail
  HINFO "WWW Server" "Linux 5.2"


#################################
 /var/named/firstdomain.rev file
#################################

@       IN      SOA     firstdomain.com. hostmaster.firstdomain.com.  (
                                      1999050900 ; Serial
                                      8H      ; Refresh
                                      2H      ; Retry
                                      1W      ; Expire
                                      1D )    ; Minimum
 NS foo.firstdomain.com.

444 PTR foo.firstdomain.com.
444 PTR www.firstdomain.com.


##################################
 /var/named/seconddomain.rev file
##################################

@       IN      SOA     seconddomain.com. hostmaster.seconddomain.com. (
                                      1999050900 ; Serial
                                      8H      ; Refresh
                                      2H      ; Retry
                                      1W      ; Expire
                                      1D )    ; Minimum
 NS foo.firstdomain.com.

444 PTR www.seconddomain.com.






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