diff --git a/manifest.json b/manifest.json
index 2b57702..b6b4cce 100644
--- a/manifest.json
+++ b/manifest.json
@@ -39,7 +39,25 @@
             {
                 "name": "password",
                 "type": "password"
-            }
+            },
+			{
+				"name": "firstport",
+				"type": "number",
+				"ask": {
+					"en": "Enter the FIRST Port that should be used by Rport eg. port for tunnels (standard 20000)",
+					"de": "Bitte geben Sie den ERSTEN Port ein, welcher von Rport für z.B. die Tunnels genutzt wird (Standard 20000)"
+				},
+				"example": "20000"
+			},
+			{	
+				"name": "lastport",
+				"type": "number",
+				"ask": {
+					"en": "Enter the LAST Port that should be used by Rport eg. port for tunnels (standard 30000)",
+					"de": "Bitte geben Sie den LETZEN Port ein, welcher von Rport für z.B. die Tunnels genutzt wird (Standard 30000)"
+				},
+				"example": "30000"
+			}
         ]
     }
-}
+}
\ No newline at end of file
diff --git a/scripts/install b/scripts/install
index 43ab9ca..abe1c38 100755
--- a/scripts/install
+++ b/scripts/install
@@ -76,9 +76,9 @@ ynh_app_setting_set --app=$app --key=api_port --value=$api_port
 guacd_port=$(ynh_find_port --port=$(($api_port + 1)))
 ynh_app_setting_set --app=$app --key=guacd_port --value=$guacd_port
 
-used_start_port=$(ynh_find_port --port=20000)
+used_start_port=$YNH_APP_ARG_FIRSTPORT
 ynh_app_setting_set --app=$app --key=used_start_port --value=$used_start_port
-used_end_port=$(ynh_find_port --port=30000)
+used_end_port=$YNH_APP_ARG_LASTPORT
 ynh_app_setting_set --app=$app --key=used_end_port --value=$used_end_port
 ynh_exec_warn_less yunohost firewall allow TCP $used_start_port:$used_end_port