Hi kevin,

The 841N is in the same subnet with C50, that is why all the devices can ping each other, while cause it cannot ping outside, the internet failed to connect.

I mentioned this example to demonstrate that the routers are connected, but not passing any data. It is as if he had something blocking the DHCP work through WDS

Did you use the C50's wifi password to configure the WDS function on the 841N? 

I don't understand that.. I use the same wifi password on both routers.. if tou see the screenshot, the WDS status on 841N in RUN (this in the documentation means that they are connected).

And cause the wifi function will be affected a lot by the interference, is it possible for you to connect the 841N to the C50 by wired cable to extend wifi signal as an access point? Below is the instruction: 

https://www.tp-link.com/en/support/download/tl-wr841n/#video

 for this setup i can't use cable.. =(

thanks

Hi,
 

Thanks for your reply, cause the 841N uses the same wifi name as C50 once they connected, please connect your computer to the 841N by wired cable and check the IP address and default gateway; and please test whether it can access internet. 

https://www.tp-link.com/en/support/faq/838/

On my first post I already told I tested connect to 841N through cable and wifi and I did not receive an IP from DHCP.. If I set my IP on windows I still have no internet.

And if you see the pictures, wifi name is different on each router

thx