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? :-\

 

 

 

 

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