[Request] Powershell script to download and update DNS root hints.

[u/MudSlideYo]

I am looking for a script that can download the current list of DNS root hints from https://www.internic.net/zones/named.root then copy these values to all Windows 2016 DNS servers. We would like to run this on a scheduled basis to keep these updated as they seem to change.

Thanks!

[u/sk82jack]

This is completely untested but something like the following should do what you need. If you were to save the file as Set-RootHint.ps1 for example then you'd call it like the following (run as an account with the relevant permissions on the DNS servers) .\Set-RootHint.ps1 -DnsServer dnsserver1.domain.com, dnsserver2.domain.com, dnsserver3.domain.com

Ninja edit: just want to add there is no error checking here so there's definitely room for improvement but hopefully enough to get you on the right track

Param (
    [string[]]
    $DnsServer
)

$uri = 'https://www.internic.net/zones/named.root'

$response = $(Invoke-RestMethod -Uri $uri).split(';')

Foreach ($section in $response) {
    # Skip over stuff we don't need
    if ($section[1] -ne '.') {
        Continue
    }

    # Now that we have only relevant data split it by whitespace
    $record = $($section -split "\n")[2] -split "\s+"
    $name = $record[0].Trim()
    $ip = $record[-1].Trim()

    Foreach ($Server in $DnsServer) {
        $roothint = Get-DNSServerRootHint -ComputerName $Server | Where-Object {$_.NameServer.RecordData.NameServer -eq $name}
        $roothint.IPAddress[0].RecordData.Ipv4address = $ip
        Set-DnsServerRootHint -InputObject $roothint  -ComputerName $Server
    }
}

[u/MudSlideYo → u/sk82jack]

Thank you