> I'm using uml_switch and manual ARP entries to about 12 UML servers.  All traffic is sent via tap0, so I can get overall bandwidth stats, but I want to gather bandwidth (bits in and bits out) stats on each UML server.  Is there a way to do this?

mrtg?

Yes, MRTG is the best way to go, however I don't know where to gather the stats on each server so that I can break down how much bandwidth each of the 12 servers are using.  ideally, I'd like to have 12 different MRTG graphs; one for each server.  I can get overall stats from the tap0 interface (bytes in and bytes out) using ifconfig but that doesn't tell me how much each UML is using.