DNS subzone resolving

Evstrati · 06-25-2012, 11:54 AM

Hello,

I have a hard time while setting up a dns server.

Actually there are 2 domains : domain.com and my.domain.com. In my.domain.com there is a www server so that www.my.domain.com opens the web page of the organisation.

In my zone.db I have :

Quote:

$TTL 1d
$ORIGIN domain.com.
@ IN SOA ns root.domain.com. (
2012250601 ; Serial
2h ; Refresh
15m ; Retry
1w ; Expire
604800 ) ; Negative Cache TTL

IN NS ns
IN MX 10 smtp

IN A 1.2.3.4
...

$ORIGIN my.domain.com.
IN MX 10 smtp

IN A 1.2.3.4
www IN A 1.2.3.4
svn IN CNAME www

So with this setup domain.com is correctly resolved as well as my.domain.com, but _not_ www.my.domain.com

Do you have any hints.

Thanks

bathory · 06-25-2012, 01:39 PM

Hi,

Quote:

So with this setup domain.com is correctly resolved as well as my.domain.com, but _not_ www.my.domain.com

How is my.domain.com resolved? Do you have an A RR for my.domain.com in the 1st part of the zone file?
You should use the @ symbol or the FQDN in your subdomain definition:

Code:

$TTL 1d
$ORIGIN domain.com.
@ IN SOA ns root.domain.com. (
 2012250601 ; Serial
 2h ; Refresh
 15m ; Retry
 1w ; Expire
 604800 ) ; Negative Cache TTL

 IN NS ns
 IN MX 10 smtp

 IN A 1.2.3.4
...

$ORIGIN my.domain.com.
@ IN MX 10 smtp

@ IN A 1.2.3.4
www IN A 1.2.3.4
svn IN CNAME www

Evstrati · 06-26-2012, 06:52 AM

Hi there and thanks for helping.

Quote:

Originally Posted by bathory

Hi,
How is my.domain.com resolved? Do you have an A RR for my.domain.com in the 1st part of the zone file?

my.domain.com is resolved as 1.2.3.4 -- the way it is defined in the zone file. In fact domain.com and my.domain.com are both pointing to the same IP address. Actually the most used domain is my.domain.com but for historical reasons I must resolve domain.com to the same IP.

Code:

;; ANSWER SECTION:
my.domain.com. 259090 IN      A       1.2.3.4

;; AUTHORITY SECTION:
domain.com.      259060  IN      NS      ns.domain.com.

;; ADDITIONAL SECTION:
ns.domain.com.   259090  IN      A       1.2.3.3

This is a dig output resolving domain.com (IP and domain changed). I don't have an A RR in the first part. In the first part is declared only domain.com and machines from this domain (www, svn, smtp etc...)

Quote:

You should use the @ symbol or the FQDN in your subdomain definition:

According to this page : http://www.zytrax.com/books/dns/apa/origin.html A blank substitution is also possible. I will however put @'s at the beginning of the corresponding lines.