powershell-add-reverselookup-ns

Add New Nameservers to Reverse Lookup Zones Script

This PowerShell script automates the process of adding new nameservers to all reverse lookup DNS zones on a DNS server. It checks if the nameservers already exist in each zone and adds them if they are not present.

Table of Contents

• Prerequisites
• Usage
• Script Details
• Customisation
• License

Prerequisites

• PowerShell 5.1 or later
• DNS server role installed on the target server
• Necessary permissions to manage DNS zones and records

Usage

1. Clone the Repository:

   git clone https://github.com/disappointingsupernova/powershell-add-reverselookup-ns
   cd add-nameservers-script

2. Edit the Script (if necessary): Update the $newNameServers list in the script with the Fully Qualified Domain Names (FQDN) and IP addresses of the nameservers you want to add.

3. Run the Script:

   ./add-nameservers.ps1

Script Details

This script performs the following steps:

1. Define the new nameservers:

   • A list of hashtables containing the FQDN and IP address of each new nameserver.

   $newNameServers = @(
       @{ FQDN = "bind1.hempshaw.internal."; IP = "192.168.53.101" },
       @{ FQDN = "bind2.hempshaw.internal."; IP = "192.168.53.102" },
       @{ FQDN = "bind3.hempshaw.internal."; IP = "192.168.53.103" },
       @{ FQDN = "bind4.hempshaw.internal."; IP = "192.168.53.104" },
       @{ FQDN = "bind5.hempshaw.internal."; IP = "192.168.53.105" }
   )

2. Retrieve all DNS zones:

   • Gets all DNS zones on the server using Get-DnsServerZone.

   $allZones = Get-DnsServerZone

3. Filter reverse lookup zones:

   • Filters the zones to get only reverse lookup zones (e.g., zones ending in .in-addr.arpa or .ip6.arpa).

   $reverseZones = $allZones | Where-Object { $_.ZoneName -like "*.in-addr.arpa" -or $_.ZoneName -like "*.ip6.arpa" }

4. Add new nameservers to each reverse zone:

   • Iterates through each reverse zone and adds the new nameservers if they are not already present.

   foreach ($zone in $reverseZones) {
       foreach ($newNameServer in $newNameServers) {
           $nameServers = Get-DnsServerResourceRecord -ZoneName $zone.ZoneName -RRType NS
           $existingNS = $nameServers | Where-Object { $_.RecordData.NameServer -eq $newNameServer.FQDN }
           if (-not $existingNS) {
               Add-DnsServerResourceRecord -ZoneName $zone.ZoneName -Name "@" -NameServer $newNameServer.FQDN -NS -TimeToLive 01:00:00
               Write-Host "Added $($newNameServer.FQDN) to $($zone.ZoneName)"
           } else {
               Write-Host "$($newNameServer.FQDN) already exists in $($zone.ZoneName)"
           }
       }
   }

Customisation

To add more nameservers, simply extend the $newNameServers list with additional hashtables containing the FQDN and IP address of the new nameservers:

$newNameServers = @(
    @{ FQDN = "bind1.hempshaw.internal."; IP = "192.168.53.101" },
    @{ FQDN = "bind2.hempshaw.internal."; IP = "192.168.53.102" },
    @{ FQDN = "bind3.hempshaw.internal."; IP = "192.168.53.103" },
    @{ FQDN = "bind4.hempshaw.internal."; IP = "192.168.53.104" },
    @{ FQDN = "bind5.hempshaw.internal."; IP = "192.168.53.105" },
    @{ FQDN = "bind6.hempshaw.internal."; IP = "192.168.53.106" }  # New nameserver example
)