Welcome, Your ASUS TUF‑AX4200 will work fine as a full replacement for the Eero 6+ if you set VLAN ID 911 on the WAN.
Giffgaff broadband runs on the same platform as Virgin Media O2 wholesale FTTP services and typically requires VLAN ID 911 on the WAN connection and WAN Connection Type is set to Automatic IP (DHCP)
Not sure on you specific router model, but generally ASUS routers have the following option;
check:
LAN → IPTV/VLAN settings
Look for:
- ISP Profile = Manual
- Internet VLAN ID = 911
In a completely sane world, madness is the only freedom (J.G.Ballard).
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