This is a case of RTFM

There is a section on "Interface by IP" in the configuration reference
on http://people.ee.ethz.ch/~oetiker/webtools/mrtg/reference.html

This should be what you are looking for I believe


>
> I want to monitor ethernet trafic using mrtg.
> I had already succes in monitor the trafic for some ip number.
> The problem is that I want to monitor the trafic in the ethernet
using ip
> alias. Can anybody help me with this ?
>
> Thanks
> Tomy
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> 		-- Samuel Beckett
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