How to install NTOP on CentOS 5.5 64bits

Quick and easisest way:
wget http://apt.sw.be/redhat/el5/en/x86_64/rpmforge/RPMS//rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
rpm -Uvh rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
yum install ntop
# Get yum ready
yum clean all
yum update
# Install Development Tools
yum groupinstall “Development Tools”
# …