Three home hubs in three houses!
This article is strictly for experimenters!It's not even one I have tried myself but a contributor to this forum posting has got this arrangement to work. Windows network has been set up and it allows file sharing etc. According to the poster all networked kit is shown in the network displays on all the PCs.
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You should first read about using home hubs as a wireless repeater connection before continuing. All the setup method is in there.
The basis of the above setup is that two slave hub are installed in neighbours houses, each of whom have BT broadband in their own right. They don't have to be family, but I suggest they should at least be trusted neighbours, because it would be very easy to use a neighbours' internet connection!
The significant requirements are:
All PCs to have static IP addresses in the usual range 192.168.1.64 thru .237
Slave PCs to have their DHCP disabled.
Slave PCs to have their own fixed IP address within the above range.
Significantly an additional change is for the slave hubs to have their Gateway IP Addresses changed to ones in the range 192.168.1.238 thru .252
All the PCs connecting to the hubs need to have a fixed gateway IP in their network connection properties fixed to match their own hub.
For security,all firewalls remain enabled.
I am assuming that The DECT telephony and some other BT features on the slave home hubs cannot be used. However I have it on good authority that functions that rely only on ethernet, such as BT Vision, do work.
Don't write to me - experiment!