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The setup would be as the diagram below.

The issue is that when in Room A, the WiFi signal from the router/modem in Room B is flaky, causing the devices in Room A to drop the connection all the time.

I can easily add another 3-port Powerline networking plug in Room A (I have them elsewhere) to get wired connections into the Wii/XBox/Sky TV box.

My question: I want to get the two WiFi devices in Room A connected via the 'mystery box', which will allow a strong signal since it is in the room, and which will use the (effectively, via Powerline) wired LAN connection to the modem/router in Room B, and not just pick up the existing WiFi signal from Room B,

So do I need something in repeater or access point mode for my mystery box, and can it be made to work over a wired connection?

enter image description here

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+1 for the diagram. –  Tanner May 23 '13 at 14:39
    
Thanks to asciiflow.com! –  Alan B May 23 '13 at 14:57
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2 Answers 2

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Looks to me like your mystery box needs to be a wireless access point.

If you'd like to roam between both WAPs (one in room B and one in room A) then set identical SSID and security settings. I would give this a try and see if it works well with your wireless devices. Wireless roaming is left up to the client device/network adapter, so your mileage may vary between machines (my Galaxy S3 roams like a boss; the wife's ancient Mac book not so much.)

If roaming doesn't work well for you, I would simply change the SSID and ignore/shut off the WiFi in room B. It depends greatly on the equipment, but I have yet to see a decent consumer repeater, and since you can run a line to your mystery box I see no reason to use a repeater.

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He'll need a switch as well for the wired nodes, unless the AP has one built in. –  Flup May 23 '13 at 14:44
    
Some do; some don't. Could also be a wireless router in bridge mode. –  Tanner May 23 '13 at 14:47
    
In terms of this approach, if I shut off the WiFi in Room B, I presume I would need to set up some sort of forwarding from the new router/AP in Room A to the router/modem in Room B, i.e. just having a wired connection between them won't automagically forward packets ? –  Alan B May 23 '13 at 15:01
    
As long as the AP in Room A is in the same subnet as the router in Room B, it actually will automagically "forward" packets. If, however, you pick up a run-in-the-mill wireless router, it will perform NAT and essentially separate your two networks (though it will still automagically work!) This is why you would want a router with bridge mode, or a WAP. –  Tanner May 23 '13 at 15:09
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You can buy combined Powerline and Wireless AP units, meaning that most of the functions of your mystery box would be subsumed into the Powerline plug. Then you can buy a cheap four-port switch to let you connect your wired boxes to the network.

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