Just online with Zen today using the 7530 PPPoE passthrough option and it works with my Ubiquiti gateway. Just need to set the 7530 to use the wrong PPPoE connection login details and it fails to establish a connection, allowing the USG to connect. I've configured the 7530 with an IP on my LAN so I can login and see the DSL stats which are quite useful. Only been up 3 hrs and I'm getting the attainable speed. Will be interesting to see over the next week or so how it compares to BT.
Ahhh, never thought of doing that bit, i.e. to make the 7530 fail the PPPOE.
My Draytek load balancer could not establish a PPPOE connection despite setting the passthrough on the Fritzbox but never tried to make the Fritzbox itself fail ...
Good pointer and I will try that, thanks