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Steps to avoid registering unwanted NIC(s) in DNS on a Mulithomed Domain Controller
Article ID: 2023004 - View products that this article applies to.
On Domain Controllers with more than one NIC where each NIC is connected to separate Network, there is a possibility that the Host A DNS registration can occur for unwanted NIC(s).
If the client queries for DC’s DNS records and gets an unwanted record or the record of a different network which is not reachable to client, the client will fail to contact the DC causing authentication and many other issues.
The DNS server will respond to the query in a round robin fashion. If the DC has multiple NICs registered in DNS. The DNS will serve the client with all the records available for that DC.
To prevent this, we need to make sure the unwanted NIC address is not registered in DNS.
Below are the services that are responsible for Host A record registration on a DC
If the NIC card is configured to register the connection address in DNS, then the DHCP /DNS client service will
Register the record in DNS. Unwanted NIC should be configured not to register the connection address in DNS
If the DC is running DNS server service, then the DNS service will register the interface Host A record that it has set to listen on. The Zone properties, “Name server” tab list out the IP addresses of interfaces present on the DC. If it has listed both the IPs, then DNS server will register Host A record for both the IP addresses.
We need to make sure only the required interface listens for DNS and the zone properties, name server tab has required IP address information
To avoid this problem perform the following 3 steps (It is important that you follow all the steps to avoid the issue).
After performing this delete the existing unwanted Host A record of the DC.
Hardware details: IBM servers with two NICs
1. Ethernet NIC2. USB NIC ( can be considered for multiple Ethernet NICs also)
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.
Article ID: 2023004 - Last Review: April 12, 2010 - Revision: 1.0