TC in a WDS network - Security Settings?!

Hello everyone,
I have successfully connected the TC as repeater to a Fritz!Box WDS network. However, this works only if I do not activate any wireless security. The setup is like this:
Fritz!Box
- Fritz!Box acts as base with internet connection and I have WDS activated
- In the Fritz!Box setup, the MAC address of the TC is entered
- No encryption of the repeater-connection (this exactly is the problem, but more on that later)
Time Capsule:
- The TC is set up to "Participate in a WDS network"
- The Fritz!Box is entered as base for the "WDS remote" option in the TC
- The SSID of the TC is set randomly (does not change if I enter the same SSID)
- Also in the 'Wireless' tab of the airport utility, I have entered no encription
As a start (and proof of concept), this works nicely. I can connect to the TC network and have a working internet connection. However, I would appreciate not having a wide-open wireless with my personal data in my apartment. So I tried changing the encryption of the Fritz!Box WDS connection (WPA or WPA2), changed the Wireless Security option of the TC (set both to the same, set both to be different)... No matter what I do, I end up being able to ping the TC, but not to the Fritz!Box and the internet connection is lost.
What is the standard way to set up a WDS network with a router and a TC? Is the "Wireless Security" option in the 'Wireless' Tab the one where I should enter the password of the WDS router? As you can see, I am a little confused to where I should enter the encryption, etc. Could someone please clarify?
Maybe a final hint: I read online that the encryption should be set to WEP (better than nothing I thought), but the TC does only give the security options "WPA/WPA2 Personal" or "WPA2 Personal" and not the option of WEP security. How can this be?!
I have been googling, reading and trying for quite some time now, but I do not seem to get this to work properly, so maybe one of you might have the answer? Any help is highly appreciated.
Thanks in advance, I am going nuts waiting for the TC to restart every second minute

Tim Kietzmann wrote:
Hello everyone,
hi Tim !
Maybe a final hint: I read online that the encryption should be set to WEP (better than nothing I thought), but the TC does only give the security options "WPA/WPA2 Personal" or "WPA2 Personal" and not the option of WEP security. How can this be?!
launch airport utility and select +manual setup+ for your TC. go to the wireless tab and option-click on the +wireless security+ pop-up menu. you should now see the option for WEP.
any help ?

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