We are facing problem for which we haven't found remedy. Problem is that on two of four domain controllers Netlogon service is registering IP address from Backup NIC even dynamic updates are disabled on network interface, also HKLM\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\{Interface_ID}\ "DisableDynamicUpdate"=dword:00000001.
Tested with nltest.exe /server:DC1 /dsgetdc:company.com and only situation when backup ip address isn't registred is when backup nic is disabled.