Hummm, thanks Hoba and thanks Chris!
I'll do an upgrade right now, but later I'll try to make a full install in order to change my hard drive to a bigger one! when I do this, I'll make copy of all my rrd graphs, maybe ntop also, in order to keep my lan History documentation.
I know it's off topic, but talking about rrd graphs, can I add between the 2days graphs and 1 month one, another graph with one week lenght??
thanks again!