You should be able to wrap the routes in a group,

Route::group(array('before' => 'auth'), function()
{ 
   .... normal routes here
});

or if you have a admin path you could use

Route::group(array('prefix' => 'admin', 'before' => 'auth'), function()
{
 ... normal routes here
});

This would be for the \admin\blah path.

You can also nest groups... here is a snip from my admin routes

Route::group(array('prefix' => 'admin', 'before' => 'auth'), function()
{
Route::group(array('prefix' => 'pages'), function()
 {
 Route::get('/', array('as' => 'admin-pages', 'uses' => 'Wpb\AdminModule\Controllers\PageController@getIndex'));
 });
});

Answers the path \admin\pages\