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Change DNS using Powershell

Posted on 2010-11-16
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Last Modified: 2012-05-10
Hi there.

I've managed to find the attached powershell script that allows me to change dns setting on a server.

If works fine except that i can only add two addresses.

I'm looking to add more than that within the advanced setting on the nic.  how do i go about this?
FUNCTION Set-DNSWINS {
#Get NICS via WMI
$Nics = get-WMIObject -class Win32_NetworkAdapterConfiguration -ComputerName $_ -Filter "IPEnabled=TRUE"

foreach ($NIC in $NICs){
$DNSSERVERS = "xxx.xxx.xxx.xxx","xxx.xxx.xxx.xxx"
$NIC.SetDNSServerSearchOrder($DNSServers)
$NIC.SetDynamicDNSRegistration("True")
$NIC.SetWINSServer.count("xxx.xxx.xxx.xxx","xxx.xxx.xxx.xxx") 
}
}

function Get-filename{
$computer = "e:\Txt_Files\dns.txt"
return $Computer
}

$f = Get-Filename
get-content $f | foreach {set-DNSWINS}

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Question by:Colchester_Institute
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4 Comments
 
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Accepted Solution

by:
Chris Dent earned 2000 total points
ID: 34144600

Hmm why do you think you can only set two?

This should work:
$DNSServers = "1.2.3.4", "2.3.4.5", "3.4.5.6"
$NIC.SetDNSServerSearchOrder($DNSServers)

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There's no reason to limit the number there to two.

Chris
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Author Comment

by:Colchester_Institute
ID: 34144667
ahh yes that works...

it was my own fault also where i'd played around with the syntax

it doesnt however let me put more than two wins addresses in...is there a way out of curiosity i can do that?
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LVL 71

Expert Comment

by:Chris Dent
ID: 34144887

Unfortunately the SetWINSServer method is a bit limited, NetSh should be able to do it, but I can't seem to get the syntax right for more than one address.

The last resort is hitting the registry, WINS addresses hide here:

HKLM:\System\CurrentControlSet\services\NetBT\parameters\Interfaces\Tcpip_<YourInterface>

There's a NameServerList beneath that. We can set that like this:
$DnsServers = "xxx.xxx.xxx.xxx","xxx.xxx.xxx.xxx", "xxx.xxx.xxx.xxx"
[String[]]$WinsServers = "yyy.yyy.yyy.yyy", "yyy.yyy.yyy.yyy", "yyy.yyy.yyy.yyy"

Get-WmiObject Win32_NetworkAdapterConfiguration -Filter "IPEnabled=$True" | ForEach-Object {
  $_.SetDNSServerSearchOrder($DNSServers)
  $_.SetDynamicDNSRegistration($True)

  Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\services\NetBT\parameters\Interfaces\Tcpip_$($_.SettingID)" `
    -Name "NameServerList" -Value $WinsServers
}

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Note that we have to force $WinsServers to be a String array (String[]) or it'll tell us to get lost.

A bit more convoluted that I prefer, but it should work :)

HTH

Chris
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LVL 1

Author Comment

by:Colchester_Institute
ID: 34145140
why thank

my manager has said hes not fussed bout the wins but it was for my own learning curve.
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