I am trying to use ntop and install it as per these howto: http://www.cyberciti.biz/faq/howto-install-ntop-on-rhel-centos-fedora-linux/ (also rrdtools): http://www.cyberciti.biz/faq/howto-install-rrdtool-on-rhel-linux/ (installed and tested as per instructions) in the a.m. howto it was not possible to use ntop at all, due to this error: ntop-3.3.9/ autogen.sh --with-rrd-home=/usr/local/rrdtool [.. lots of information ..] configure: error: Unable to find RRD at /usr/local/rrdtool: please use --with-rrd-home=DIR error; note that even with the proper "DIR" information it returns such error AND stops. then I installed ntop with yum - all runs smoothly and ntop runs (apparently) normal here EXCEPT that, when asking for any graphic (network load, traffic) it doesnot show any graph, just this message: "NOTE: this page is not operational when the RRD plugin is disabled, misconfigured or missing." BUT.. these (and some others) are already enabled. So, I am stuck: HOW can I got those nice graphics? think that it is closely related with those "Unable to find RRD at /usr/local/rrdtool", but I have nor error messages nor log's pointing me to the right direction. Any hint, pls?