Out of curiosity, I setup a spare D-Link DIR-850L as VLAN 600 AP, connected to router's Port 4, unplugged network cable from the STB, and connect the STB's Wifi to the D-Link. It works, but some channels were sometimes lagging, some other channels were lagging alot, and changing channels took longer time.

The D-Link were inside store room below stairs, and the STB is in living room. Wifi strength at the STB around -55 dbm, so Wifi strength actually quite decent. Maybe a stronger AP works better. Maybe someone can lend me a spare C1200 I can try?

Wired setup still better. My typical setup is a single CAT 5E cable from store room to living room, carrying both Internet & HyppTV signal to STB / living room AP, via VLAN trunk.

This post has been edited by taqu: Dec 23 2019, 08:30 AM

Does the Orbi have IGMP version setting? If yes, select version 3.

Yes it does, I think "Enable IPV4 Multicast", and setup to N only. But still lags on some channels. Maybe TP-Link C1200 with better Wifi performance will fare better. Maybe I need to try out on my C1200 too

This post has been edited by taqu: Dec 23 2019, 02:01 PM

You need 2 VLAN-capable switches at both sides of your Powerline, 1 to trunk both VLAN after router, another before your TV box/STB. TP-Link TL-SG105E & SG108E is what I use at my home.

Not sure you can trunk directly from your Asus, even with Merlin.