[mrtg] Math logic

[Jon Rust]

I have a colo taking up 2 ports on my switch. One of the servers is a 
web box, the other is the db backend. The db server doesn't 
communicate with anything but his web box.

I want to monitor his traffic consumption, but not the traffic 
between his 2 hosts. I have this config, but it seems to be coming up 
a little off based on my other measurements (I have a route-map in my 
7206 forcing all his traffic down an almost completely unused T 
(outbound-wise anyway)).

   Target[target]: 12:public at 10.10.10.10 - -13:public at 10.10.10.10

This seems like it should be:

   # net incoming traffic on port 12 is equal to total port 12 incoming traffic
     minus total port 13 traffic outgoing.

   # net outgoing traffic on port 12 is equal to total port 12 outgoing traffic
     minus total port 13 traffic incoming.

Am I missing something obvious?

Thanks,
jon

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