I have a website and a person is trying to traverse the directories. All the website is secure and he cannot exploit any hole. However, as he is trying to traverse the directories, he sends 200 requests per seconds. This causes to shut down our server or slow downs to death. How can I block or protect against it?
I am using Php, Apache and MySql. I also use .htaccess file.
Update
I have a shared hosting so I do not have access to apache to install any plugin/mode. Other similar questions on SO are for the developers with access of apache server.