veeam-ip-fix2.ps1

#
# Cred to Chris.Childerhose on the Veeam community forum for the initial script. 
# https://community.veeam.com/script-library-67/powershell-migrate-vms-from-hyper-v-to-vsphere-1585?postid=12982#post12982
#
# This is version works with 1 och 2 dns addresses.
#

$path = "C:\TEMP\NetIP.json"

if (-not (Test-Path $path)) {
    $NetIP = Get-NetIPConfiguration

    # Check if IP address is not APIPA
    if ($NetIP.IPv4Address.IPAddress -notlike "169.25*") {
        $myObject = [PSCustomObject]@{
            IPAddress = $NetIP.IPv4Address.IPAddress
            Subnet   = $NetIP.IPv4Address.PrefixLength
            Gateway  = $NetIP.IPv4DefaultGateway.NextHop
        }

        # Filter out $NetIP.DNSServer.ServerAddresses[] to only include IPv4 addresses
        $dnsAddresses = $NetIP.DNSServer.ServerAddresses | Where-Object {
            # Check if the address is a valid IPv4 address
            $_ -match "\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b"
        }

        # Add DNS server addresses
        if ($dnsAddresses.Count -eq 1) {
            $myObject | Add-Member -Type NoteProperty -Name DNS1 -Value $dnsAddresses
        }
        if ($dnsAddresses.Count -ge 2) {
            $myObject | Add-Member -Type NoteProperty -Name DNS1 -Value $dnsAddresses[0]
            $myObject | Add-Member -Type NoteProperty -Name DNS2 -Value $dnsAddresses[1]
        }

        # Save IP configuration to JSON file
        $myObject | ConvertTo-Json -Depth 1 | Out-File $path
    }
}

$hypervisor = Get-CimInstance -ClassName Win32_ComputerSystem | Select-Object -ExpandProperty Manufacturer

# Check if VM is running on VMware
if ($hypervisor -match "vmware") {
    # Get CD-ROM drive letter and path to VMTools installer
    $cddrive = Get-Volume | Where-Object{$_.DriveType -eq "CD-ROM"}
    $installer = "$($cddrive.DriveLetter):\setup64.exe"
    $arg = '/S /v /qn ADDLOCAL=ALL'

    # Check if VMTools ISO is mounted
    if (Test-Path $installer) {
        Start-Process $installer -ArgumentList $arg -Wait
    }

    # Check if there is a backup of the IP configuration and restore to new VMXNET3
    elseif (Test-Path $path) {
        $myObject = Get-Content $path | ConvertFrom-Json
        $alias = Get-NetIPConfiguration | Where-Object {$_.InterfaceDescription -like "*vmxnet*" } | Select-Object -ExpandProperty InterfaceAlias
        New-NetIPAddress -InterfaceAlias $alias -IPAddress $myObject.IPAddress -PrefixLength $myObject.Subnet -DefaultGateway $myObject.Gateway
        if ($myObject.DNS2) {
            Set-DnsClientServerAddress -InterfaceAlias $alias -ServerAddress ($myObject.DNS1,$myObject.DNS2)
        } else {
            Set-DnsClientServerAddress -InterfaceAlias $alias -ServerAddress $myObject.DNS1
        }
    }
}