How to change default redirect URL in modules middelware laravel 5?

i use module in my project

App -> 
   Modules ->
      Admin -> 
          Http ->
              controller
              middleware
              request

how i use authenticate and redirect auth file in this middleware authenticate file or redirectauth file in this middleware

authenticate.php

public function handle($request, Closure $next)
    {
        if ($this->auth->guest()) {
            if ($request->ajax()) {
                return response('Unauthorized.', 401);
            } else {
                // return redirect()->guest('auth/login');
                return redirect()->guest('admin');
            }
        }

        return $next($request);
    }

redirectauthenticate.php

 public function handle($request, Closure $next)
    {
        if ($this->auth->check()) {
            // return redirect('/home');
            return redirect('admin/dashbord');
        }

        return $next($request);
    }

how i solve this problem?

via Chebli Mohamed