I am working with my ISP to determine why I'm getting RST packets when external devices are trying to connect to internal devices. I ran WireShark on the internal network but now the ISP would like me to get a packet capture between the incoming router and my firewall.

I don't have a hub or managed switch that I can use but I do have an available Windows 2003 server with two NICs. Is there a way to configure Windows 2003 so that the traffic will just flow through the two NICs without my having to assign them IP addresses. Basically, I just want it to act like a repeater so that I can monitor the traffic. TIA for any advice.