If the Hub is in Modem Mode you need to use the IP Address 192.168.100.1.
In Modem Mode only 1 ethernet port is enabled.
If the Hub is in Router Mode you need to use the IP Address 192.168.0.1.
Try the connecting the laptop to the Hub by using the ethernet cable that goes to the Power Line Adaptor.
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BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.