Yeah you add them together, mix them up. Since you dragged this old thread out this is how you do it. You add one IP to the other and connect to the resultant IP. Here's how...

12.34.124.101 First IP
12.666.3.23 Second Pagan IP
-------------------
24.700.127.124

That instantly bypasses ALL security because the host computer gets an I.D. 10 Error with a tee factor.