DNS Stop Responding after one line was added

My wuestion is base on the code below. The DNS server is workng now But I do not understand why.Can somebody outhere give or guide to an explanation what was tha I did to make it work?
Is there any tool to check the systaxtof a DNS file? why it have to be so hard to update a namaed file witout messit up?
; Notes
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$ORIGIN domainname.edu.
$TTL	14400
@	IN  	SOA   servername.domainname.edu.                   staff.domainname.edu. (
		; Serial Number YYYYMMDDVV
			; Refresh in
			; Retry in
			; Expire in 
			; Minimum TTL of
        )
		IN	NS	Server1
			NS	Server2
 		IN      A       <IP web site hosted out side premises>
www		IN	CNAME	@
 
Server1		IN	A	<server IP>
Server2		IN	A	<server IP>
 
 
; A records and CNAMEs
name		IN	A	ip number 
name		IN	A	ip number 
name		IN	A	ip number 
name		IN	A	ip number 
 
This was working fine. Now I included the line on; A records and CNMES as:
 
kbp           IN      A       <IP hostess outside our premises>
 
And the DNS stopped working (the idea here was that anyone can type n the address browse kbp.domainname.edu and will go to the right web site. It was just a redirection
 
Now After many changes and many questions the line that worked was:
 
Forentdomain.com.   IN   A          < IP hostess outside our premises>
kbp                 IN   CNAME      Forentdomain,com.
 
So the dns dis not work with
; A records and CNAMEs
name		IN	A	ip number 
name		IN	A	ip number 
name		IN	A	ip number 
name		IN	A	ip number 
kbp         IN    A       <IP hostess outside our premises>
 
But it worked now with:
name		IN	A	ip number 
name		IN	A	ip number 
name		IN	A	ip number 
name		IN	A	ip number 
Forentdomain.com.   IN   A  < IP hostess outside our premises>
kbp                 IN   CNAME      Forentdomain.com.
====why the forentdomain.com.  works on theeft side of the file? it should not be at the right side?????======

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Jorge-123Asked:
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Kerem ERSOYPresidentCommented:
Hi,,
there are several problems with your SOA record, The commented areas should have some values such as:

You dont need this line:
$ORIGIN domainname.edu.

Please modify the values such as these:


$TTL    7200
@       IN      SOA   servername.domainname.edu.                   staff.domainname.edu. (
                       2009070401  ; Serial Number YYYYMMDDVV
                       3600              ; Refresh in
                       600                ; Retry in
                       1209600        ; Exipires
                        7200             ; Minimum TTL of
        )

For acceptable values for these values please see RFC-1912 and RFC-2308.

There's no problem with the definition:

kbp           IN      A       <IP hostess outside our premises>

It should normally work but I guess the problems with SOA has prevented it.

For a detailed problem record see your /var/log/messages file.



 
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Jorge-123Author Commented:
KeremE:
Thanks. I will look for the log files also I will look for the RFC.
When DNS stop responding , the NAMED file started fine but none of the names on the db.domainame.edu was resolving ( ????) .
Is there a utilility that I can test the named  or the databases inside it  that they are well written ? or theore is a way to test this file before puttingit on a live system?
just plain curuiosity.
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