The probe checks for traffic before and during tests and either pauses or waits before testing.
- It will not be able to see your traffic, so may test during your use and compete for capacity,
- This may affect you and your results, by slowing either or both.
Try connecting some, or eventually all, devices to it to see if they are enabled - usually most devices have no problem.
Interesting, I've got mine running on a DMZ at the moment as I've got a bridge between gateway and firewall and the DMZ hangs off the firewall.
I'll try place it inbetween the two tonight and see what happens.