bandwidth usage in bytes on Linux

[Jesper Johnson <jesper.johnson (at) welho.com>]

Hi

I'm looking for a way to create graphs for hobbit on Linux to monitor network bandwidth 
usage, separately on each interface (eth0,eth1). The provided netstat rrd Network I/O 
graph measures packets/second but I want bytes/second, which netstat0 (as defined in 
hobbitgraph.cfg) is supposed to graph but it doesn't since the netstat -s command on my 
server (RHEL4) doesn't return any byte statistics (only packets).

I suppose I could build something like this (monitoring the /proc/net/dev file) myself if 
I looked into setting up a custom rrd and so forth, but I'm hoping to save some trouble by 
asking if someone here has already done this :-D

Help, anyone?