script to set DNS servers of all IP enabled NICs on a host

set-dnsservers.ps1

#http://blogs.technet.com/b/heyscriptingguy/archive/2012/02/28/use-powershell-to-configure-static-ip-and-dns-settings.aspx
function set-dnsservers {

  param(
  [string[]]$dnsservers,
  [string]$computername
  )
  
  #you must filter by ip address, otherwise it will affect all ipenabled NICs, which will include any iSCSI
  $wmi = get-wmiobject -ComputerName $computername win32_networkadapterconfiguration -filter "ipenabled='true'" | where {$_.ipaddress -like "192.168.50*" }

  #http://msdn.microsoft.com/en-us/library/windows/desktop/aa393295%28v=vs.85%29.aspx
  $dnsmethodreturnvalue = $($wmi.SetDNSServerSearchOrder($dnsservers)).returnvalue
  if ($dnsmethodreturnvalue -ne "0"){
    write-error "SetDNSServerSearchOrder win32_networkadapterconfiguration function failed with error $dnsmethodreturnvalue. http://msdn.microsoft.com/en-us/library/windows/desktop/aa393295%28v=vs.85%29.aspx"
  }
  else {
    write-output "DNS servers $dnsservers has been set on $computername"
  }
}


#example enumerating all VMs on a vCenter server (note that I am usign the `Name` property of VMs, as we name our VMs the hostname of the server

Connect-VIServer -Server $vCenter -User $user -Password$
$vmnames = $(get-vm -name VMnameprefix-*).name

$dnsservers = "192.168.0.1","192.168.0.2","192.168.0.3","192.168.0.4"

foreach ($vm in $vmnames){
  set-dnsservers -computername $vm -dnsservers $dnsservers
}