Your options vary based on the type of environment you re in the type of equipment you re using and the results that you want to achieve.
Extending wifi two floors.
There are right ways do do things and there are wrong ways with almost nothing in between.
Wifi uses radio signal on the 2 4ghz and 5ghz band to extend network connectivity to end user device.
If you are creating a lan to wan network plug the other end into the wan or internet port on the secondary router.
Several manufacturers recommend putting the antennas at either a 45 degree diagonal or parallel to the floor at zero degrees to get the best coverage in a two story home.
Frankly as we see it your friend probably has 3.
2 connect one of the powerline network adapters to an open lan port on each router.
3 plug both adapters into the nearest electrical outlets.
There are plenty of ways to extend wifi range outside from floor to floor or from building to building without having to make hefty investments or become a certified network engineer.
Almost all technology including wifi is pretty black and white and leaves very little to no room at all for interpretation.
Plug one end of the ethernet cable into any lan port of the primary router then plug the other end of the cable into the lan port on the back of the second router.
Drywall can degrade a wireless signal quite quickly especially if the signal has to pass through extra insulation and piping such as a wall shared by a bathroom.
1 place the second router in a central location on your home s second floor.
These small units plug into an electrical outlet and then can be configured to repeat the signal.
The very simplest approach to extending your wi fi network is to add one or more range extenders.
You d be repeating that signal to a device 6 floors up from you.
Think of it this way you live on the second floor how strong is the signal there.
Boosting wifi signal from neighbor by extending with repeater.
It s not very likely that he ll get anything at all.
Connect the two routers.
You probably aren t getting full bars with 2 floors between you and the wifi source.
There are a variety of different signal issues that can come up when trying to provide comprehensive wireless coverage to your entire home.