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[tiffy]

Just started using BT Smart Hub 2 on FTTP, it's default LAN address is 192.168.1.254.
Would like to change this to 192.168.0.254  and change allocated LAN address'es to 192.168.0.***.
The reason being, most of my current LAN clients, RPi's, security cameras NVR etc. are configured with fixed IP address'es in the 192.168.0.*** range.
I can of course change all the LAN clients but it would be much easier to change the Hub IP address range.

The BT SH 2 won't let me change the IP address range, am I doing something wrong or is this not possible? 

[gt94sss2]

Look under Advanced Settings/My Network/IP4 Configuration

[tiffy]

Yes, had tried that briefly last night, tried to change "Hub Gateway IP address" first but won't allow until a matching "server address range" sub-net is selected first and this must be done under the "Custom" option.
Could probably have left the "Hub Gateway IP address" at "1" sub-net and just changed the "server address range" to "0" sub-net, didn't try.

Saves me a lot of messing about with my existing locally configured static address devices which are all happily connected again now under new management.

[tiffy]

Still struggling this morning with my Shelly devices on the new BT SH 2, they are all Wi-Fi connected with my energy monitor (Shelly-EM) collating data to a RPi-3B+ running as a MQTT Broker and Grafana display interface, the RPi itself being ethernet LAN connected was still on line.
Have found that Shelly units Wi-Fi configuration can be quite tricky and time consuming so sought an easier alternative.

Changed the Hub Wi-Fi SSID and password to the same as my previous (FTTC) router, success, all Shelly devices back on line without any re-configuration.
Have lost approx 36 hours energy data but I can live with that.
Added bonus that mobile phones, Google hub's etc don't have to be Wi-Fi re-configured.