Can anyone help a home network problem, please?

Hi there,

I wonder if anyone can help me with a home network issue.

Current Setup
We have two buildings on our property. The main house [building 1] is the primary internet access point. It has a fibre internet line into the house / router. From the router are Ethernet cables and other cables that connect to the TV, PCs etc. It provides Wi-Fi as well. From the router runs a cable also to the cottage [building 2]. For the purpose of this discussion, the SSID for the network in the house is Firehouse.

The cottage, which is used for guests, is connected to the main house / router with the aforementioned cable. It runs into a wireless range extender, which provides Wi-Fi, as well as Ethernet cable connections to a PC and TV. The SSID for the network in the cottage is the same as the SSID in the main house i.e. Firehouse.

You can see the current setup in this image -

The Problem
We have a problem with the network in the cottage. In certain parts of the cottage, when connected over Wi-Fi, a phone/laptop or other devise tries to connect to the router in the main house, not the range extender in the cottage. This is frustrating because the Wi-Fi signal strength on the phone/laptop/devise is poor, resulting in very slow (or at times non-existent). I don't understand why the phone/laptop/devise is connecting to the router in the house and not the wireless extender in the cottage. As I said, it is only in certain parts of the cottage i.e. the parts closer to the main house. How can I stop any devises from connecting over Wi-Fi to the router in the main house?

I thought it would be good if I rename the network in the cottage, but apparently this is not possible because the wireless network extender is an internet access point only. It requires the same SSID as the main house.

If I changed the wireless range extender to a router, can I connect the new router with a cable (as shown in the image) to the router in the main house? And if possible, will this allow me to change the SSID in the cottage?

I know an alternative is to put a separate line into the cottage, but due to the cost, I would like to avoid this for now.

I hope this is clear and makes sense. I am not an IT person, so do not know too much about these things. Please feel free to ask me questions if you need any further information or clarification.

Any help/suggestions will be appreciated.

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Windows 10 does this.
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I am far from an expert, but I am running a similar setup at home. I have a Linksys router with WiFi disabled plugged in to my cable modem (located literally in one corner of my house). Into that router are plugged a PC located right there and a Cat6 going to my centrally located 2nd Linksys WiFi router. (Location of cable modem will not allow complete WiFi coverage from there). This 2nd one is my primary router for all WiFi in the house, TVs, Apple TVs, mobile devices, etc.

Additionally, I have a 3rd Linksys router plugged in via cat6 to this 2nd router. 3rd router is configured with a permanent VPN connection so any devices connected via Ethernet or WiFi TO THIS LAST ROUTER are all routed through my VPN.

Three different routers, three different names (even though the first router has WiFi off it is still a completely different network than the other two.) The only thing challenging about the whole setup was getting the VPN router configured the first time.

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