Mohammed Wasay
Mohammed Wasay

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

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:

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:

<#
.SYNOPSIS Get Network Information for a list of servers
.DESCRIPTION Get Network Information for a list of servers (Primary, Secondary, Tertiary DNS Values and more)
.NOTES Needs to be run in PowerShell with elevated permissions (run as administrator).
Version: 1.0
Author: Mohammed Wasay
Email: hello@mowasay.com
Web: www.mowasay.com
Creation Date: 02/13/2020
.COMPONENT No components or modules are required to run this script.
.Parameter ComputerName List of Computername or single computer name can be used as a parameter. If no value is specified it will just return results of the local computer.
.EXAMPLE .\Get-NetworkInfo.ps1 -ComputerName $Server
#>
[cmdletbinding()]
param (
[parameter(ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)]
[string[]] $ComputerName = $env:computername
)
begin { }
process {
foreach ($Computer in $ComputerName) {
Write-Verbose "Working on $Computer"
if (Test-Connection -ComputerName $Computer -Count 1 -ea 0) {
try {
$Networks = Get-WmiObject -Class Win32_NetworkAdapterConfiguration `
-Filter IPEnabled=TRUE `
-ComputerName $Computer `
-ErrorAction Stop
}
catch {
Write-Verbose "Failed to Query $Computer. Error details: $_"
continue
}
foreach ($Network in $Networks) {
$IPv4 = $Network.IPAddress[0]
$IPv6 = $Network.IPXAddress
$MACAddress = $Network.MACAddress
$Gateway = $Network.DefaultIPGateway[0]
$DNSDomain = $Network.DNSDomain
$DNSServers = $Network.DNSServerSearchOrder
$PrimaryWINS = $Network.WINSPrimaryServer
$SecondaryWINS = $Network.WINSSecondaryServer
$NetworkName = $Network.Description
$NetBios = $Network.TcpipNetbiosOptions
If (!$DNSServers) {
$PrimaryDNSServer = "Notset"
$SecondaryDNSServer = "Notset"
$TertiaryDNSServer = "Notset"
}
elseif ($DNSServers.count -eq 1) {
$PrimaryDNSServer = $DNSServers[0]
$SecondaryDNSServer = "Notset"
$TertiaryDNSServer = "Notset"
}
elseif ($DNSServers.count -eq 2) {
$PrimaryDNSServer = $DNSServers[0]
$SecondaryDNSServer = $DNSServers[1]
$TertiaryDNSServer = "Notset"
}
else {
$PrimaryDNSServer = $DNSServers[0]
$SecondaryDNSServer = $DNSServers[1]
$TertiaryDNSServer = $DNSServers[2]
}
If (!$PrimaryWINS) {
$PrimaryWINS = "Notset"
}
If (!$SecondaryWINS) {
$SecondaryWINS = "Notset"
}
If ($network.DHCPEnabled) {
$IsDHCPEnabled = $true
}
If ($Network.TcpipNetbiosOptions = 0) {
$NetBios = "Default"
}
elseIf ($Network.TcpipNetbiosOptions = 1) {
$NetBios = "Enabled"
}
elseIf ($Network.TcpipNetbiosOptions = 2) {
$NetBios = "Disabled"
}
$OutputObj = New-Object -Type PSObject
$OutputObj | Add-Member -MemberType NoteProperty -Name ComputerName -Value $Computer.ToUpper()
$OutputObj | Add-Member -MemberType NoteProperty -Name NetBios -Value $NetBios
$OutputObj | Add-Member -MemberType NoteProperty -Name IPv4 -Value $IPv4
$OutputObj | Add-Member -MemberType NoteProperty -Name IPv6 -Value $IPv6
$OutputObj | Add-Member -MemberType NoteProperty -Name Gateway -Value $Gateway
$OutputObj | Add-Member -MemberType NoteProperty -Name MACAddress -Value $MACAddress
$OutputObj | Add-Member -MemberType NoteProperty -Name DNSDomain -Value $DNSDomain
$OutputObj | Add-Member -MemberType NoteProperty -Name PrimaryDNSServer -Value $PrimaryDNSServer
$OutputObj | Add-Member -MemberType NoteProperty -Name SecondaryDNSServer -Value $SecondaryDNSServer
$OutputObj | Add-Member -MemberType NoteProperty -Name TertiaryDNSServer -Value $TertiaryDNSServer
$OutputObj | Add-Member -MemberType NoteProperty -Name PrimaryWINSServer -Value $PrimaryWINS
$OutputObj | Add-Member -MemberType NoteProperty -Name SecondaryWINSServer -Value $SecondaryWINS
$OutputObj | Add-Member -MemberType NoteProperty -Name IsDHCPEnabled -Value $IsDHCPEnabled
$OutputObj | Add-Member -MemberType NoteProperty -Name NetworkName -Value $NetworkName
$OutputObj
}
}
else {
Write-Verbose "$Computer not reachable"
}
}
}
end { }
view raw Get-NetworkInfo.ps1 hosted with ❤ by GitHub

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.

Import-Module ActiveDirectory
#Get all the domain controllers in the domain
$Servers = Get-ADDomainController -Filter *
#Path to the output file
$output = "C:\temp\$env:USERDOMAIN-Servers-NetworkInfo.csv"
foreach ($Server in $Servers.Hostname) {
#Make sure the path of the previous file is the same, or modify the below. Get-NetworkInfo.ps1 to the location where the file was copied. In my case (C:\temp)
.\Get-NetworkInfo.ps1 -ComputerName $Server | Export-Csv -Path $output -NoTypeInformation -Append -ErrorAction SilentlyContinue
}
Write-Host -ForegroundColor Green "Done!"
view raw Get-Remote-NetworkInfo.ps1 hosted with ❤ by GitHub

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