Switching internet access from HomeHub 5 to HomeHub 4 .... and back again

The existing HomeHub 5 stopped working, and although a replacement was on order from BT, it would not arrive immediately.

As we still had the old HomeHub 4 (which was being used as a wireless extender), the idea was to re-use that.

The big difference between HH4 and HH5 is that the latter has an integrated modem. So it's necessary to reconnect that for access to the outside world to be possible.

The existing DSL cable from the master socket, rather than going directly into the HomeHub, goes via the modem like so:

And then there is a separate ethernet cable (with the red plug) that goes from the modem into the HH4 like so:

As the HH4 had been used as an extender, it had been give a new IP address. This needed to be changed. For this, an ethernet cable needs to be connected from a laptop to the HH4 directly, going into settings. The HH4 original settings were:

These are simply changed to replace the IP address with the default gateway (which is 192.168.1.254) and *most importantly* turn ON the DHCP server (this is turned off when the HH4 is acting as an extender to avoid conflicts where two HomeHubs are attempting to issue addresses).

This results in:

Once the new HH5 is in place, the modem can be removed, the DSL cable directed straight to the HH5 and the HH4 put back in its place, back to its original settings (with DHCP disabled).

Network set up

To try and get a decent signal throughout the house, this is the set up:

This is the rear of the HomeHub 5, where connection to outside world comes in.

Sonos Bridge is self explanatory. TP-Link is a very long Ethernet cable connecting to TP-Link WA 901 extender in kitchen. On Hub is not currently in use.

The link to Billion Router goes here:

The HomePlug cable goes off to this socket:

And then connects downstairs to a re-commissioned HomeHub 4: