Windows，DHCP服务器预订-查找免费IP地址

Question

我正在尝试编写一个脚本，它将为DHCP设备找到(稍后添加预约)。我遇到的问题是，有一个范围，在这个范围内，我们手动划分为不同的IP范围，其中应该添加某些类型的设备。

例如范围10.92.0.0/24，我们将范围指定为

10.92.0.10-20用于iPhones等，10.92.0.10.50用于安卓手机等。

我已经知道脚本可以遍历我提供给它的IP范围，或者获得DHCP预订或者显示错误。我一直在想，第一个错误可以被视为免费IP。

有人有什么想法吗？)

    # Get DHCP Scope
$Start = 100
$End = 140
$DHCPServer = "dhcpserver.company.com"

# Find Free IP address
    #It can use to get DHCP reservation by IP and find the one which returns error - which can be used as the free one - loop done
    #Now how to tell it to stop when the error occures?
While ($Start -le $End) {
    $IP = "10.92.0.$Start"
    Write-Host "Reservation for: $IP" -ForegroundColor Cyan
    Get-DhcpServerv4Reservation -ComputerName $DHCPServer -IPAddress $IP
    $Start++
}

Answer 1

您可以将Get-DhcpServerv4Reservation的输出分配给一个变量，然后执行以下操作：

While ($Start -le $End) {
    $IP = "10.92.0.$Start"
    $reservation = Get-DhcpServerv4Reservation -ComputerName $DHCPServer -IPAddress $IP -ErrorAction SilentlyContinue

    if($reservation){
        Write-Host "Reservation for: $IP" -ForegroundColor Cyan
        $reservation
    }
    else {
        Write-Host "No reservation found for: $IP" -ForegroundColor Red
        break #comment out to continue through all IPs in Scope
    }

    $Start++
}

Answer 2

为什么不使用专用cmdlet Get-DhcpServerv4FreeIPAddress

Get-DhcpServerv4FreeIPAddress -ScopeId "192.168.1.0" -StartAddress "192.168.1.100" -EndAddress "192.168.1.140" -ComputerName "dhcpserver.company.com"