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Multiple SOA A records

Posted on 2009-05-12
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Last Modified: 2012-05-06
Windows 2003 r2 DNS

I have multiple SOA A records listed on internal DNS servers.  These records point to other non NS server IPs on the LAN, but am not sure why they are even registered as SOA A records.

Why would I have these extra SOA A records?
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Question by:ARob720
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7 Comments
 
LVL 13

Expert Comment

by:3nerds
ID: 24367753
Can you give me an example.

The only thing that I could think that may require that would be if you have multiple sub-domains and want separate SOA for each sub domain. for example

Taken from: http://whatexit.org/tal/mywritings/dnssoa.html

fast.com.   IN SOA      ns1.fast.com. dude.fast.com. (
                        883081600 ;serial (version)
                        3600      ;refresh period
                        600       ;retry refresh this often
                        2592000   ;expiration period
                        1800      ;minimum TTL
                        )

2.fast.com.   IN SOA      ns1.2.fast.com. dude.fast.com. (
                        883081600 ;serial (version)
                        3600      ;refresh period
                        600       ;retry refresh this often
                        2592000   ;expiration period
                        1800      ;minimum TTL
                        )


Regards,

3nerds
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Author Comment

by:ARob720
ID: 24368245
I am calling it an SAO because they lists the name as (Same as Parent Folder) but in actually they are A records.  Is there a purpose to have multiple (Sam as Parent Folder) A records for multiple servers across the domain?  There are also (Same as Parent..) NS records but I can understand why those would exist.
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LVL 13

Expert Comment

by:3nerds
ID: 24368322
Right Click on the name of you forward lookup zone and select properties
Click the Name server tab
Do the servers listed there match the extra A records listed?
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Author Comment

by:ARob720
ID: 24368488
5 NS that are listed in the NS tab.  All have a corresponding (same as parent...)  NS and A records.  Then I have 2 other (same as parent...) A records that correspond to non NS servers around the domain.  

After further investigation the remaining 2 IPs are for replicating AD machines that are not running DNS.
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Accepted Solution

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3nerds earned 1000 total points
ID: 24368518
So I think you just answered the question.

The first 5 were created when you added those server to the NS tab the other 2 were added for AD replication. If all records point to active DNS or AD boxes they are necessary.

Regards,

3nerds
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LVL 13

Expert Comment

by:3nerds
ID: 24368543
If you no longer use those IP addresses as Name servers then you can remove them from the name server tab which I believe asks you or removes the A records automatically. Been a bit to remember exactly.

Hit submit a bit to quick =)
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Author Comment

by:ARob720
ID: 24368592
No, I it looks like everything adds up, NS servers with NS and A records and AD (only) servers with only A Records.

Thanks for getting me there.
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