@sindhi It's called Client Isolation in C20:

@Waterfox This happens when the regional support page ("nl" in your case) is not updated with the latest FW release. Best practise to check for the latest FW release would be to use the global...

@Jeroenvdooren If you want to use the C3200 in AP mode (as an access point) use this guide for configuring.

@Kathyh If your Deco units are not amongst the models (or they are not updated to the latest FW release) in the thread I posted earlier, then you won't have it.

@Kathyh When you have to use an ISP router it's better to set Deco in AP mode as you did to avoid the double NAT in your LAN. Now what I've understood from your post is that you need to use the Deco...

@1382-837366__71 This router model (TL-WR850N) is not supported by the Tether app - here's the tether compatibility list.