thank you I will do some researchMake a simple script that you can insert in all pages and log all traffic. Then analyze it and block the traffic either from the same script or iptables. 99% of bot traffic can be stopped with a few lines of codes and a heavy list of patterns.
RewriteCond %{HTTP_USER_AGENT} AltaVista [OR]
RewriteCond %{HTTP_USER_AGENT} Googlebot [OR]
RewriteCond %{HTTP_USER_AGENT} msnbot [OR]
RewriteCond %{HTTP_USER_AGENT} Slurp
RewriteRule ^.*$ IHateBots.html [L]