http://hostinghelp.biz/content/ddos-%D1%87%D1%82%D0%BE-%D0%B4%D0%B5%D0%BB%D0%B0%D1%82%D1%8C-%D0%B5%D1%81%D0%BB%D0%B8-%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80-%D1%82%D0%BE%D0%BB%D1%8C%D0%BA%D0%BE-%D0%BE%D0%B4%D0%B8%D0%BD-linux-%D1%81-apache

article describes some recipes to counter DDoS using iptables limit and string matching filters. Useful