interfaces: one sweep through the file

src/etc/rc.initial.setlanip

@@ -489,7 +489,8 @@ $upperifname = strtoupper($interface);
 if (!$dry_run) {
     echo "\nPlease wait while the changes are saved to {$upperifname}...";
     write_config(sprintf('%s IP configuration from console menu', $interface));
-    interface_reconfigure(strtolower($upperifname));
+    interface_bring_down($interface);
+    interface_configure($interface);
     echo "\n Reloading filter...";
     filter_configure_sync();
     if ($restart_dhcpd) {