Performance tools with NIC Usage

I am planing to move my AS/400 to a remote location(Outsourcing).
But, I am stuck with the task of evaluation the type of network links we are
going to need.

I've ran the performance tool for a week I had a peek utilization of the
communication line of 0.08%.
I have 2 Network cards, both at 100mps(One is connected to an ISDN and the
other to the LAN(10mps)

Does the performance tools take into acount that I have two network cards?
        If not, which one is in monitoring?
And does they include the regular network trafic(Packet sent to other
servers)?
        If so, is there a way to filter it?

Thanks!

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