rules2mrtg Files

This program will create MRTG data traffic graphs derived from iptables's
internal traffic statistics for the 
local machine for every configured IP number/ethernet alias. You can also
define ports or portranges to be monitored per IP address.

So.. you don't need SNMP which can't handle ethernet aliases... AFAIK.

You probably want this solution if you want to monitor every single active
configured ip addres and what ever port ranges on a local machine.

If you are looking to monitor several machines you are probably better of
with MRTG/SNMP on some sort of dedicated server.

has only been tested on fedora/centos/rhel 5 machines, will probably run on any recent machine with iptables/mrtg/bash

just make sure you configure the correct paths for your specific OS.