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Multi-home Windows 2003 AD Server - Issue with DNS Host A record disappearing

Posted on 2008-10-30
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I have a Windows 2003 server with 2 NICs.  It is using both NICs - they are on different subnets.
For some reason - the A (host) record for the one NIC will register in DNS and stay there.  The other (from the other NIC) will not.  I can even manually add it - but in a short period of time - approximately 10 minutes - the A record I create will be gone.  What is making this A record I add - disappear?
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Question by:kstet
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by:brent_caskey
ID: 22847845
Hello kstet,

I dont think that you will want both IP addresses to register in DNS. This usually causes AD replication issues on the domain controller. When there are 2 NICs on the domain controller, dns name resolution lookup returns requests in a round robin fashion. If both addresses are registered in DNS and you have clients in subnet A trying to find this domain controller, the dns server may return the domain controllers subnet B address. The same would go for other domain controller trying to contact this domain controller while they are trying to replicate.

Here is a reference article for more information: http://support.microsoft.com/kb/272294

Regards,

brent_caskey
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by:kstet
ID: 22851176
Hi Brent.  Thanks for the reply.
I can see how having it multihomed is an issue - but there are reasons I need to keep it this way for now.
The issue really is - why is the A Host record for the subnet B being deleted from DNS?
I'm adding it - but it is disappearing after about 10 to 15 minutes or so.
What is actually deleting it - and how can I make that A Host record stay in DNS?

Maybe coming about this a different way - what if I left it out of DNS.
But in the other Domain controller - I put something in the hosts file, etc. - so it could find it's partner domain controller.  
What entry would I need to put in what file (hosts, something else) so that one comain controller could see another (without using DNS)?    (it used to be LMHOSTS - or HOSTS - when using WINS)
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brent_caskey earned 2000 total points
ID: 22852158
On the nic in subnet B, in the advanced properties, do you have it set to register the dns connection? If not, it may be removing the record itself.

You can set up an A record manually and deny the servername$ account the delete permissions.
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