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How to share 1 DSL internet connection between 2 WLAN networks (40-50 meters distance)


At the moment I have 2 WLANs on 2 buildings 40-50 meters apart. Then there is 3rd building almost in between these having no WLAN at the moment.

See rough  sketch about building location.

On building A there is a DSL modem A-link RR24 and D-link DIR-615 wireless WLAN station(Wireless Router). There is only 1 client on this "huge" network, laptop with D-link DWA-140 USB wireless connectivity device/adapter.  

On building B there is A-link RR-24AP (i+) modem/router/WLAN station. There is also only 1 client pc and modem is located on place of letter uppercase 'B' in my sophisticated map :-)  
Modem placement is fixed, I would have put it in a place of 'R' but the wires came impractical and onto the way...
About signal carrying tests on aforementioned environment:

When testing DIR-615 in n-mode the signal from building A carried like the line L is drawn, just outside the brickhouse B. Measurement was done by walking with laptop equipped DWA-140.
No signal inside --> test failed.

Then tested coverage of A-link RR-24 in g-mode  inside B and it covered at least most of the building. However not carrying long outside the building measured with laptops b/g internal WLAN adapter.                    

Now I am planning to throw away RR-24 modem and get rid of DSL connection in A. Instead internet should be available by using connection shared from B by RR-24 AP(i+). Because this device only supports b/g mode the g is preferred and N is not used. I feel N-mode did not deliver the promises of extended range anyway.

Finally on to the questions: What is preferred way to implement sharing of B's internet connection to A and B WLANs? Would it be possible to use BRIDGE MODE with TP-Link's TL-WA501G 54Mbps Wireless Access Point (http://www.tp-link.com/products/product_des.asp?id=36) ?
This device would be cheap, but will it work together with these other devices A-link RR-24AP (i+) and D-link Dir-615 ? Will I need 1 or 2 of these Tp-links to create bridge between these 2 WLANS? Traps and pitfalls on these ideas, feel free to tell if I have totally misunderstood something!!!!

I also know that something similar could be done with Access Points with WDS, but I am not sure if wanting to buy any more hardware. I am not sure if WDS works ok with these existing devices.

And what about repeaters, it seems they are not that great but could be simple to setup??

I must say that I am totelly overwhelmed with complexity of this "easy wireless technology" as I thought it should be nowadays.  
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1 Solution
Well.....there are multiple solutions. None are cheap but the first solution would be to place wireless bridges at each location with directional antennas. One bridge would be the host bridge feeding wireless to the other two

The second solution would be to set up a mesh wireless network  in bldg C & place wireless repeaters in bldg A & B.
tknuutAuthor Commented:
Hello again!

I have decided that I will add directional antenna outside of building B (RR-24APi+).
Antenna will be placed in a way that there is direct path to ANOTHER antenna outside of Building A (Dir-615).
I am going to use G-mode only, not taking advantage of N features in Dir-615. Antennas will be DIY antennas.

If I have understood correctly I may use Access Point/ WDS feature in Dir-615 and thus avoid using (and buying) additional bridge devices?? Is this correct assumption?

Any comments and further advices are welcome, I will wait Your comments and if "Lights are Green" I will start building these antennas...

You'll either have to have a bridge or a AP set up as a repeater in bldg B. Basically you'll need something to catch & re-generate the wireless signal into bldg B.
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tknuutAuthor Commented:
I am sorry to be such a pain in the butt, but I still need clarification, maybe a drawed diagram about the devices in buildings A and B.

My suggestion is:

Building A: Modem/router/WLAN A-link RR-24 AP(i+) and antenna outside. Note: At the moment I would not use WLAN inside A,only LAN-connection to router. Therefore only antenna output in RR may be connected to outdoor antenna.  

Building B: Modem/router A-link RR + WLAN A-link Dir-615 + 1 indoor antenna and 1 outdoor antenna
Dir 615 has fortunately 2 antenna connections so this should work as written.

Where would I put these bridge/repeater devices, I don't fully understand. If you manage to clarify that I will give You points and start building antennas :-)
tknuutAuthor Commented:
Sorry I mixed my fine naming system. Swap the A and B in previous post. RR-24AP(i+) is in B and Dir 615 in A.
tknuutAuthor Commented:
Additional question about WDS:

Dir-615 has some kind of WDS, where I can input ssid and channel used in RR24APi+ settings. Is this connection enough between these networks? Does data go from A to B and B to A?

I am sorry if I seem to be so stubborn not accepting to buy 1 or more TP_link's bridge devices unless it is the only solution...
Yes to both questions. I think this is your only solution is to get a bridge.
tknuutAuthor Commented:
Ok, I go and buy one TP-Link's TL-WA501G 54Mbps Wireless Access Point and put that in bridge more in building B.  

I am still quite confused on this topic, but now it is enough to know that I don't need awfully lot of expensive devices.  Thanks for help, it is unfortunate that I am so slow learner on this topic...
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