I'm using the following devices for my home network:

Router 1: Speedport W 723 V (192.168.2.1)
Router 2: AVM Fritzbox 3270 (192.168.2.2)
NAS: Synology DS 207+(192.168.2.3)

I successfully set up a WDS connection between the two routers. The Speedport acts as basestation, the Fritzbox repeats the WIFI signal of the Speedport.

Everything fine, so far.

Now I'm trying to achieve the following:

Client → Speedport (Base) → Fritzbox (Repeater) → Synology NAS

I want to use my Synology NAS attached to the Fritzbox (which is in repeating mode). I already gave it a static IP (as written above) but all connection attempts failed.

Did I miss something out or is this set-up simply impossible?