Change the IP address of the second hub to 192.168.1.253 and disable DHCP. Connect the 2 hubs together LAN port to LAN port via the powerline adaptors.
Also best to set the wireless on the 2 hubs to different channels to avoid interfering with each other
I've deleted the other thread.
Not sure why it isn't working, works a treat for me.
You will get PPPoE errors in the slave hub logs as there is no PPPoE connectivity.
You will be wasting your time with support, there is far more knowledge here on the forum.
Ah, thought the PPPoE errors were on the slave. Seems a bit of a coincidence but I can't see how anything you have done would have caused the problem. Might be worth trying a factory reset of the Hub by pressing the recessed button with a pin until the lights flash.
Are you getting DSL events in the log as well or just PPPoE?