Get Primary, Secondary, Tertiary DNS values and more from Multiple Servers

February 13, 2020
0

Came across a unique request to get primary, secondary, and tertiary DNS values for multiple computers/servers across the domain. I started writing the script and got what I wanted.

Now this started off as just to query for DNS Server information, but then I thought to add other pieces to get myself a good Network Inventory of all the servers in the environment.

I am utilizing the Win32_NetworkAdapterConfiguration WMI Class to get the required information.

You can modify the script below to suit your needs. The complete list of settings that can be captured:

  string   Caption;
  string   Description;
  string   SettingID;
  boolean  ArpAlwaysSourceRoute;
  boolean  ArpUseEtherSNAP;
  string   DatabasePath;
  boolean  DeadGWDetectEnabled;
  string   DefaultIPGateway[];
  uint8    DefaultTOS;
  uint8    DefaultTTL;
  boolean  DHCPEnabled;
  datetime DHCPLeaseExpires;
  datetime DHCPLeaseObtained;
  string   DHCPServer;
  string   DNSDomain;
  string   DNSDomainSuffixSearchOrder[];
  boolean  DNSEnabledForWINSResolution;
  string   DNSHostName;
  string   DNSServerSearchOrder[];
  boolean  DomainDNSRegistrationEnabled;
  uint32   ForwardBufferMemory;
  boolean  FullDNSRegistrationEnabled;
  uint16   GatewayCostMetric[];
  uint8    IGMPLevel;
  uint32   Index;
  uint32   InterfaceIndex;
  string   IPAddress[];
  uint32   IPConnectionMetric;
  boolean  IPEnabled;
  boolean  IPFilterSecurityEnabled;
  boolean  IPPortSecurityEnabled;
  string   IPSecPermitIPProtocols[];
  string   IPSecPermitTCPPorts[];
  string   IPSecPermitUDPPorts[];
  string   IPSubnet[];
  boolean  IPUseZeroBroadcast;
  string   IPXAddress;
  boolean  IPXEnabled;
  uint32   IPXFrameType[];
  uint32   IPXMediaType;
  string   IPXNetworkNumber[];
  string   IPXVirtualNetNumber;
  uint32   KeepAliveInterval;
  uint32   KeepAliveTime;
  string   MACAddress;
  uint32   MTU;
  uint32   NumForwardPackets;
  boolean  PMTUBHDetectEnabled;
  boolean  PMTUDiscoveryEnabled;
  string   ServiceName;
  uint32   TcpipNetbiosOptions;
  uint32   TcpMaxConnectRetransmissions;
  uint32   TcpMaxDataRetransmissions;
  uint32   TcpNumConnections;
  boolean  TcpUseRFC1122UrgentPointer;
  uint16   TcpWindowSize;
  boolean  WINSEnableLMHostsLookup;
  string   WINSHostLookupFile;
  string   WINSPrimaryServer;
  string   WINSScopeID;
  string   WINSSecondaryServer;

Since the scripts are querying for information it is best if it runs from a DC or a privileged server with an account that has privileged access.

To get the results you need the following two scripts:

I needed to get all the network information for all the domain controllers in the domain. So the following code retrieves it for me. This came really handy in viewing all the DNS settings setup on all the DCs and correcting them if needed.

This will get the information and export to an excel file that you can have handy for reference or auditing. Hope this helps!