Okay.
Now you've turned off UPNP in your router, the next step is...
Turn off PC UPnP Service:
1. Press: Windows-button (the one between lAlt and lCtrl) + R, a window should pop up.
2. Write: "services.msc" (without the ") then press enter.
3. In the list of services, scroll down to "UPnP Device Host", click it and press "Stop service".
4. Now do the same thing but with the service "SSDP Discovery".
5. Exit the window and go to control panel-> Network and Internet-> Network and Sharing Centre-> Change advanced sharing settings (to the left)-> Under "network discovery" select to turn off network discovery
6. SAVE CHANGE
(I cannot remember if I done this on both computers... But I know I done it. Try on one computer. If it works then great, if it does not then do it on both computers)
There is also a registry edit that you can try. That is simple and easy.
Here is a point towards it: http://www.battlefield4online.com/play-battlefield-3-two-more-pcs-same-network/3173/
Enjoy
Check your router to make sure how many people can be on it at one time.I set mine to the number of devices in the house that used a internet connection. Say it is set to 6 users at one time max and you have 1 laptop, 1 cell phone and 2 dvd players running that would only leave access for 2 more users.Most devices have auto update turned on so when you power them up they maintain a internet connection. The other thing is that I assigned a perminant IP to all devices on my router so that I had no more conflict issues and prior I did have them.
