I have a site, the server provide only allow 2000GB/month ($0.02/GB extra). I have monitor the bandwidth in my control panel, every day, i have about 12GB Inbound, but 100GB+ Outbound, a number very shockly.My sys is CentOS with LAMP, can anyone introduce some method or software to monitor the thing what I mind? Which page or folder cost such huge bandwidth? Thanks. 
LAMP CentOS page/folder Outbound Inbound bandwidth monitor
centos;monitoring;bandwidth