Create address filter for reaching remote server, if it's network connection is Public

Set-FirewallFilter.ps1

#Requires -Modules NetSecurity

    # Remote admin network
$RemoteNet = '1.2.3.4/255.255.255.248'
$AddressFilter = Get-NetFirewallRule -Group '@FirewallAPI.dll,-30267' |
    Where-Object Profile -like 'Public' |
    Get-NetFirewallAddressFilter

if ($AddressFilter.RemoteAddress -NotContains $RemoteNet) {
    $remoteFilter = @($AddressFilter.RemoteAddress) + $RemoteNet
    $AddressFilter | Set-NetFirewallAddressFilter -RemoteAddress $remoteFilter
}