I created this script to change DNS Server entries on 2012 R2 servers
#Script gets a servers ip details and change the DNS server entries on the adapter
$ServerName = "PC"
$DNSServerAddresses = "10.104.2.51,10.104.2.52,10.104.2.53,10.104.2.54"
Write-Host "Lets see if it is turned on $ServerName" -foreground green
$Test_Connection = (test-connection -Count 2 -ComputerName $ServerName -ErrorAction SilentlyContinue -WarningAction SilentlyContinue )
$Test_Connection
if ( $Test_Connection -eq $NULL)
{
Write-Host "Cannot Ping $ServerName" -foreground Red
return
}
Else
{
Write-Host "Can ping $ServerName so carrying on" -foreground green
}
$CIMSessionA = New-CimSession -computername $ServerName
$ServerNetAdapter = Get-NetIPInterface -AddressFamily ipv4 -InterfaceAlias Ethernet -CimSession $CIMSessionA
# Count the number of interfaces returned as we only deal with one interface
$count = 0
foreach ($item in $ServerNetAdapter)
{
$count++
}
if ($count -gt 1)
{
Write-Host "Too many Interfaces!!!" -foreground red
}
else
{
if ($ServerNetAdapter.DHCP -eq "Disabled")
{
Write-Host "$ServerName network adapter is static" -foreground Green
Write-Host "Current DNS settings:" -foreground Green
$CurrentAdapaterSettings = Get-DNSClientServerAddress –InterfaceIndex $ServerNetAdapter.IfIndex -CimSession $CIMSessionA
$CurrentAdapaterSettings | Select |FT
Set-DNSClientServerAddress –InterfaceIndex $ServerNetAdapter.IfIndex -ServerAddresses $DNSServerAddresses -CimSession $CIMSessionA
Write-Host "New settings:" -foreground Green
$CurrentAdapaterSettings = Get-DNSClientServerAddress –InterfaceIndex $ServerNetAdapter.IfIndex -CimSession $CIMSessionA
$CurrentAdapaterSettings | Select |FT
Remove-CimSession $CIMSessionA
}
else
{
Write-Host "$ServerName network adapter is on DHCP" -foreground yellow
Get-DNSClientServerAddress –InterfaceIndex $ServerNetAdapter.IfIndex -CimSession $CIMSessionA
}
}