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. Unwanted NIC should be configured not to register the connection address in DNS.
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.
DNS server service (if the DC is running DNS server service). 
To prevent this issue, we need to make sure the unwanted NIC address isn't registered in DNS.īelow are the services that are responsible for Host A record registration on a DC: The DNS will serve the client with all the records available for that DC. The DNS server will respond to the query in a round robin fashion if the DC has multiple NICs registered in DNS.
The client queries for DC's DNS records, and gets a record of a different network that isn't reachable to the client. The client queries for DC's DNS records, and gets an unwanted record. If one of the following conditions is true, the client will fail to contact the DC causing authentication and many other issues: On Domain Controllers with more than one NIC where each NIC is connected to separate Network, there's a possibility that the Host A DNS registration can occur for unwanted NICs. Please post web links to the modem so I can tell if it does NAT (Network Address Translation).This article provides a solution to an issue where unwanted network interface controllers (NICs) are registered in Domain Name System (DNS) on a multihomed domain controller (DC).Īpplies to: Windows Server 2012 R2 Original KB number: 2023004 Symptoms This all depend that the ISP mode/router does do NAT. This way you can plug the PC into the either that ISP modem/router and the Mac on wireless will be in the same subnet to share files and the dreaded NAT will go away Because only the ISP router is dishing out IPs. If this is so, log into that ISP router and make surer it is acting like a router, move to set four. 
A PC is NOT a switch so you network design is flawed!ī) ISP Router (that some ISPs are including in the modem they give customers). That is why people use routers at home because more and more devices needs IPs.Ģ. If the ISP modem/router is not a router then it will just dish out 1 IP. No the Main router (the one that is closet to the modem) should be the one that does NAT.
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