diff --git a/src/Service/Config.php b/src/Service/Config.php
index 4fd8cc7..88944bb 100644
--- a/src/Service/Config.php
+++ b/src/Service/Config.php
@@ -9,19 +9,27 @@ namespace Pfatt\Service;
  */
 class Config
 {
-    private string $pingHost = '8.8.8.8';
+    private string $pingHost;
     private string $ontInterface;
     private string $rgInterface;
     private string $rgEthernetMac;
 
-    public function __construct(string $ontInterface, string $rgInterface, string $rgEthernetMac, ?string $pingHost = null)
+    public function __construct()
     {
-        $this->ontInterface = $ontInterface;
-        $this->rgInterface = $rgInterface;
-        $this->rgEthernetMac = $rgEthernetMac;
-        if (isset($pingHost)) {
-            $this->pingHost = $pingHost;
+        if (file_exists('/etc/pfatt.ini')) {
+            $configs = parse_ini_file('/etc/pfatt.ini');
+            if ($configs === false) {
+                // @todo warn something is wrong with the ini file.
+                $configs = [];
+            }
+        } else {
+            // @todo warn this could be a problem.
+            $configs = [];
         }
+        $this->pingHost = (string) ($configs['ping_host'] ?? '8.8.8.8');
+        $this->ontInterface = (string) ($configs['ont_if'] ?? '');
+        $this->rgInterface = (string) ($configs['rg_if'] ?? '');
+        $this->rgEthernetMac = (string) ($configs['rg_mac'] ?? '');
     }
 
     /**