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I had already replaced that one router with a different one, powered down the entire network and devices and restarted everything but that did not help. I've use inSSIDer to find the best possible channels and have set them to 2, 6 and 10. Works perfectly downstairs where inSSIDer sees only my network and one or two more, but upstairs it is seeing up to 10 different wireless networks, some with equal or higher signal strength than my own routers. I'm assuming that that is part of the root cause, but I have no idea how to resolve it. I have a fourth router I could install to boost the WIFI signal strength, but than I run into conflicts with my own SSID channels. Problem inside the house is that there is a lot of steel reenforced concrete which pushes me to install multiple routers.
I'm open to suggestions but after spending already 3 weekends trying to reconfigure I'm about ready to give up
I always heard that you should not give all wifi routers the same channel?
In any case, the setup was all routers using the same SSID, security type (WEP) and password. Only the channels were different. Using inSSIDer I found that 2, 6 and 10 had the least interference with the other WIFI in the area.
As you suggested I changed the SSID of the router upstairs (added an A to the name) and Mac, Ipod, Iphone were able to connect. Only the PC now is unable to connect to this network. I tried with both a windows 7 and a windows XP latptop. They can connect downstairs to the old network name, but not upstairs to the changed name.
Was it the intention to leave the two separate network names or was this only intended as a test?
By the way, when I was looking into the problem earlier I read an article somewhere that on the DHCP server WMM should be activated for Apple devices. It was not active so I did activate it.
Everything seems to work OK now. I found the reason why the Windows PC were not able to connect upstairs as well. The router had authentication type shared key. I changed that to open system now and everything seems to work.
So I should leave all routers on the same channel now? Any article I'm reading on the internet states that they should be different and spread as good as possible. Example extract below:
Make sure the wireless settings of the second router is the same as the first router. Same SSID, same security type, same password. The only difference will be the channel. Moreover, we'll want to make sure the channels are sufficiently far apart.
I took this from a random blog, but they all state the same.
OK, I'll leave the settings as is as it all seems to work now.
Thanks again for your help. We can finish this question.
Have a nice day