RT-AC87U - DHCP Client list

Hello,

I just bought Asus router and I have a question regarding AsusWRT. My current configuration looks like that:
Asus: Main router
TP-Link - It connects to Asus via WIFI and it works as a repeater/extender for 3 devices connected via lan cable (wifi connection to that router is not possible).

Previously as a main router I used also a TP-Link and I switched to Asus for better performance/range.

Now the tricky part - I cannot see those LAN devices connected to TP-Link. I only see a...

RT-AC87U - DHCP Client list