[LARTC] Monitoring traffic

[Alex]

Does anybody know a good ip traffic monitoring software that has multiuser
capability?
I need some type of software with an interface on which users can login with
their user/pass and see how much traffic (how many megabytes) they consumed
over a certain period of time. Speed graphs are NOT a must, just something
to show them hou much traffic they did.
I'm currently using net-acct mysql but with little success because on RH9
the netacctd daemon dies unexpectedly sometimes without any error.

Thanks!

Alex