[Ntop-dev] help

[qiaoyong]

ntop-dev:         I need your help.I install ntop on redhat linux7.1 and monitor my subnet.That computer is a gateway.but how can I store the traffic or measuring data that acrossing the gateway.If i shut down the computer,all message i needed disappear.I want to know how much data that one host of my subnet received and accepted in one month.         I browsed www.ntop.org and read the documents,nevertheless i can't find how to realize it.please recommend some guides to me or tell me what to do.         when i run 'perl myMQLserver.pl &',it told me 'couldn't use DBI'.         thanks!                                                                                             dvdv