BACnet Protocol Stack

Hi,

first of all I have to say the more I work with Bacnet the more I like it.
I don't see myself as a developer and for my purposes the demo applications work fine for me.
But now I ran into a problem at a XP-machine with several Ethernet-Interfaces. They are all in use with differen IPs.
Problem I have is that bacrp.exe (or any other program) binds to another interface I actually want to comunicate to.

Setup:
IF1: 10.0.0.1
IF2: 192.168.0.1

I want to read from a device with IP 10.0.0.100.
I get Error: APDU Timeout!
With wireshark I could see that bacrp.exe has bind to IF2 and send with IP 192.168.0.1 and never gets an answere.
Only solution I found so far was disable IF2 and it works.

My question is, is it possible to make any of this programs bind to IF1 directly?

Thanks in advance