Fail in login and admin auth laravel 4 - laravel

Question

My problem is that if I enter the url http://localhost/login or http://localhost/admin returns infinite loop browser. But income smoothly panel I created.
File routes.php
#Crea la primera para hacer login
Route::get('/', function()
{
return View::make('login');
});
#Permite desloguear al usuario
Route::get('/logout', function()
{
Auth::logout();
#Al desloguear saca al usuario al index
return Redirect::to('/');
});
#Enruta hacia el controlador para hacer el login
Route::controller('check', 'Login');
#No permite el ingreso a panel sin antes estar auntentificado
Route::get('panel', array('before' => 'auth', function() {
return View::make('dashboard.index');
}));
File Login.php in Controllers
Here you enter the login and redirects panel, if replacement by admin panel returns loop.
<?php
class Login extends BaseController {
public function postUser()
{
// get POST data
$userdata = array(
'username' => Input::get('username'),
'password' => Input::get('password')
);
if(Auth::attempt($userdata))
{
// we are now logged in, go to admin
return Redirect::to('panel');
}
else
{
return Redirect::to('/')->with('login_errors',true);
}
}
}
Filters.php
/*
|--------------------------------------------------------------------------
| Authentication Filters
|--------------------------------------------------------------------------
|
| The following filters are used to verify that the user of the current
| session is logged into this application. The "basic" filter easily
| integrates HTTP Basic authentication for quick, simple checking.
|
*/
Route::filter('auth', function()
{
if (Auth::guest())
{
if (Request::ajax())
{
return Response::make('Unauthorized', 401);
}
else
{
return Redirect::guest('login');
}
}
});
Route::filter('auth.basic', function()
{
return Auth::basic();
});