Monitoring a LAN with mrtg
I'm (as I speak) setting up an old 486 (dual NICs) as a firewall-type system.One thing I'd like to eventually do is have it show me mrtg graphs for all the hosts going through it; ie, be able to pull up a graph for any particular computer on the LAN and see how much traffic's been going through my firewall (ie, onto the Internet).
However, I don't have a fancy switch/router to query via SNMP. Is it somehow possible to log traffic use per incoming IP? :-\