I finally installed OpwnWrt on my Belkin RT3200 with the latest release today. I connected the Belkin RT3200 to my Modem to get an internet connection. The internet connection is working fine and well.
Now I want to connect my Rapberry Pi with installed AdguardHome to my Belkin RT3200 with ethernet cable. I set the Raspberry Pi on my OpenWrt on static IP with 192.168.1.142. I set the Port on AdguardHome to 5335. I set the DNS forwardings to 192.168.1.142#5335 on my OpenWrt. But nothing is not getting blocked by AdguardHome and I don't see any Client's on AdguardHome. Btw I set the Upstream DNS server on AdguardHome to 127.0.0.1:5335. The Teststream is working fine.
Please help how do I get it connected with listed Clients with blocking Ads.
Is there a way that all traffic goes trough the adguardhome without setting the dns from adguardhome on every device. I mean. If a device connects to the router I want that automatically adguard blocks ads on the device.
It doesn't need to go "through" it, the clients need to use it as their DNS, which the link you've been given solves, without hard coding it on each device.