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Internal / external DNS

Posted on 2014-02-11
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Last Modified: 2014-02-17
I have a domain mydomain.com  I also have an external POP3 mail server mail.mydomain.com.  when I try to resolve mail.mydomain.com internally it resolves to and old external IP address.  (we just switched mail carriers) Externally mail.mydomain.com resolves correctly to the new external IP.  I looked in DNS and there is not any records pointing to the old IP.  I looked at the HOSTS file on the server and there is no entry's.

Any place I can look to find out where this pointer to the old IP address is?  Also I was going to just put in a new A Record to point mail.mydomain.com to the new IP address but I would receive this error message.

host record mail.mydomain.com can not be created node is a cname dns record.

Any Ideas?
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Question by:Corporal_K
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by:Mandeep Khalsa
ID: 39851714
Try "ipconfig /flushdns" from the command prompt to clear the cached DNS entries on your DNS server.
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Expert Comment

by:David Johnson, CD, MVP
ID: 39851979
It may be set at the registrar of your domain
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Author Comment

by:Corporal_K
ID: 39853528
ipconfig /flushdns is the first thing I tried.  I even rebooted the server.  For a work around I added the entry's for mail.mydomain.com and www.mydomain.com to the hosts file and then it resolves to the correct IP.  Problem is I do not want to edit the hosts file on all the computers.  Also if I remove the hosts entry's it reverts back to the old IP address.

@David  This works externally fine so can't be the registrar or I don't see how it could be???
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Expert Comment

by:Mandeep Khalsa
ID: 39853712
Have you checked your DNS's PTR records as well? Maybe a reversing entry there is what is causing this? And you only have 1 DNS server correct?
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Corporal_K earned 0 total points
ID: 39853997
Problem is resolved.  The issue was there were A records pointing to the old IP address.  The entry's did not show because there was a filter on the list.  I have never used the filter so I did not even know it was there.
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Author Closing Comment

by:Corporal_K
ID: 39864316
There were DNS entry's
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