Bandwidth usage

[Dave Withnall <withnall@connexus.net.au>]

Greetings,

I've just set myself up with an openBSD 3.2 box as my gateway, and I'm 
trying to figure out how to get it to tell me how much traffic has passed 
through its external interface so I can monitor my network usage and stop 
myself from getting huge bills from my ISP.

Anyways, as I'm rather new to all this (2 whole weeks) I've been reading a 
lot of stuff on the net about all sorts of things. The one thing I haven't 
been able to figure out is how to get this bandwidth monitoring going. I've 
started trying to set up ipfm & mrtg but got lost and confused.

Could any of you people out there please explain how I can get a bandwidth 
monitor running. I'd like to be able to get some sort of web interface that 
has something easy to understand (preferably with graphs) so I can stop my 
fiancee from downloading too much.

I've so far been able to figure out everything else except this. Any 
suggestions would be appreciated.

Regards
Dave.