How to share internet connection over wifi to an ethernet decive using airport express?

Hi i have a device that it can only be connected to the internet via ethernet in a diferent room (and far) where my primary internet connection is. I have my network configured like this: cable modem >>> connected via ethernet >>> to airport time capsule >>> connectes via wi fi >>> to airport express last generation "n" >>> connected via ethernet cable to device. The problem is that i'm not having internet conection in my ethernet connected device. Anyone know if I have to configure something in some special way or if i'm doing something wrong?
Thanks
Guido

It should work fine..
To figure this out, check if the Express is connected by wireless properly and getting an IP.. you will see that in airport utility.
Make sure you are set to either extend or join the wireless network. The Express should then pass an IP to the "device".
No luck start over.. reset everything to factory.
If the TC is older model use 7.6.1 firmware.. it works much better for extend wireless.
Use short names.. 2-20 characters no spaces and pure alphanumeric.
Then set the Express again in extend wireless mode.
It is pretty easy in v6 airport utility. Look at the posts from Bob Timmons on how to extend wireless.. he must have answered those question a thousand times in the last few years.
Here is one I did. https://discussions.apple.com/message/24161378#24161378

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Hallo,
first, sorry for my bad english...
i have a mac mini 2011 with os x mavericks and os x server.
i use a vpn connection for my mobile clients. these clients need to connect to the internet with the same connection as the server.
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How to share internet connection over wifi to an ethernet decive using airport express?

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