After some half-good script kiddies found out about this exploit or DDoS method, they have been doing it like crazy to websites, game servers, and now my home servers which allows me to work on some of my client's websites and different projects for people. My ISP is calling me, complaining about it and how it is using up a lot of their bandwidth. They are complaining that they are going to shut off my business plan service if it does not stop.
Also, all of my home servers run Fedora 17, PHP 5.5, Apache 2.6, MySQL 5.5.
How can I patch or block this method of attack?