tools for network traffic accounting

[Philip Hallstrom]

> I would like to configure a monthly report of the incoming and
> outgoing amount of traffic on the network interface of my server, for
> instance in the monthly run output.
>
> Can I do this with a built in program of FreeBSD 6.0 or do I need a port?

If you just wanted a total count and run ipfw (or any firewall i imagine) 
you could simply add a rule to count all inbound and outbound packets then 
at the end of the month look at them, then zero them.

It could be automated...

Otherwise, there's mrtg, cacti, and tons of others :)