Public/New-IPPoolOverload.ps1

<#
    .Description
    Create a New Overload IP Pool
 
    .Parameter IPPoolName
    Specify a Unique name for the IP Pool
 
    .Parameter CIDR
    Specify a CIDR address. ex: 192.168.0.0/24
 
    .Example
    $Params = @{
        IPPoolName = "SSLVPNNAT"
        CIDR = "192.168.1.0/24"
    }
    New-IPPoolOverload @params
 
    .Example
    New-SSHSession -computername 192.168.0.1
    $Params = @{
        IPPoolName = "SSLVPNNAT"
        CIDR = "192.168.1.0/24"
    }
    $command = New-IPPoolOverload @params
    $result = Invoke-SSHCommand -Command $command -SessionId 0
    $result.output
 
    This example generates an SSH session and invokes the output of this function against that session.
 
    .Example
    New-SSHSession -computername 192.168.0.1
    New-SSHSession -computername 192.168.1.1
    $Params = @{
        IPPoolName = "SSLVPNNAT"
        CIDR = "192.168.1.0/24"
    }
    $command = New-IPPoolOverload @params
    $sessions = Get-SSHSession
    foreach ($session in $sessions) {
        Write-Output "Invoking Command against $session.host"
        $result = Invoke-SSHCommand -Command $command -SessionId $session.sessionID
        $result.output
    }
 
    This example generates multiple SSH sessions and invokes the output of this function against all active sessions.
 
    .Notes
    Source NAT (IP Pool) and Destination NAT (Virtual IP) \
 
    Destination NAT changes the destination address of packets passing through the Router. It also offers the option to perform the port translation in the TCP/UDP headers. Destination NAT mainly used to redirect incoming packets with an external address or port destination to an internal IP address or port inside the network. \
 
    Source NAT is most commonly used for translating private IP address to a public routable address to communicate with the host. Source NAT changes the source address of the packets that pass through the Router. A NAT pool is a set of addresses that are designed as a replacement for client IP addresses.
 
    .Link
    https://github.com/TheTaylorLee/AdminToolbox/tree/master/docs
#>


Function New-IPPoolOverLoad {

    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $true)]$IPPoolName,
        [Parameter(Mandatory = $true)]
        [ValidateScript( {
                if ($_ -match '^[0-9]{1,3}[.]{1}[0-9]{1,3}[.]{1}[0-9]{1,3}[.]{1}[0-9]{1,3}[/]{1}[0-9]{2}$') {
                    $true
                }
                else {
                    throw "$_ is an invalid pattern. You must provide a proper CIDR format. ex: 192.168.0.0/24"
                }
            })]
        $CIDR
    )

    $calc = Invoke-PSipcalc $cidr
    $StartIP = ($calc).HostMin
    $EndIP = ($calc).HostMax

    Write-Output "
config firewall ippool
    edit ""$IPPoolName""
        set startip $StartIP
        set endip $EndIP
    next
end"

}