Ask Slashdot: MRTG and IP Accounting

Webdude asks: "I run a server that has many IP aliases and have found a very strange thing: all the aliases receive data but all data is sent out through eth0. I have MRTG up and running but it doesn't help me because all traffic is going out eth0. I set up IP Accounting and found that it records the packets traveling properly but now my big question is how do I get MRTG (or something similar) to graph the stats that are in the IP Accounting tables???"