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Use same SSID from my AT&T modem in my Google WiFi Pro, make devices find each other on the network

RickyGRockStar
Community Member

I have the AT&T router installed in my garage and the Google WiFi hardwired inside the home (3pk) connected to the ATT router

Currently I have both ATT and Google Wifi under separate SSIDs and working, but the devices in my garage that connect to ATT cannot connect/see each other that are in the Google Network

I understand the ideal situation will be to disable the WiFi on the ATT modem and buy another Google point for the garage, but the garage walls are cement and wifi signal inside is very very poor so the ideal situation will be to keep the ATT modem wifi but make them all connect to the same network and if possible use the same SSID.

Inside the garage (and right outside) I have devices that connect to the garage opener and Google cameras so they have to be in the same network.

Any help on how to set it up so I can keep the ATT wifi is appreciated

2 Recommended AnswerS

David_K
Diamond Product Expert
Diamond Product Expert

Your best option here is most likely to put your AT&T modem in something called IP passthrough mode. 

Configuring IP Passthrough and DMZplus - AT&T Internet Customer Support

This will disable the Wi-Fi on your AT&T modem leaving just your Google Wifi network which you should connect all your devices to, instead of some to your AT&T modem and some to your Google Wifi network. Your AT&T modem will purely be used as a modem and not a modem and router combination like it is currently, resolving the issue. If this causes signal coverage issues in your garage, you may need to look at investing in an additional Wifi point. If you do go down this route, it's important to review the guidance below.

Where to place your Wifi devices - Google Nest Help

One thing that's not explicitly stated is you should aim to place your primary Wifi point as close as possible to the centre of your home. That's because the Google Wifi and Nest Wifi mesh system uses a fewest hops approach. If one of your secondary points can get even a weak connection to your primary Wifi point, it will do that instead of going through an intermediary Wifi point that may physically be closer. That's why not installing them in a straight line, and placing your primary Wifi point close to the centre of your home really helps, along with all the other guidance in that article above.

View Recommended Answer in original post

David_K
Diamond Product Expert
Diamond Product Expert

The reason I suggested as above is because what you're asking for simply is not possible on a technical level. There is no way to do what you're asking I'm afraid.

You may have seen you can put Google Wifi in something called bridge mode (same idea as what AT&T call IP passthrough mode), however that's not only strongly not recommended as it disables many of its security features, but it's also only possible if you only have 1 Google Wifi device, and don't have multiple Google Wifi points to create a mesh Wifi network.

View Recommended Answer in original post

4 REPLIES 4

David_K
Diamond Product Expert
Diamond Product Expert

Your best option here is most likely to put your AT&T modem in something called IP passthrough mode. 

Configuring IP Passthrough and DMZplus - AT&T Internet Customer Support

This will disable the Wi-Fi on your AT&T modem leaving just your Google Wifi network which you should connect all your devices to, instead of some to your AT&T modem and some to your Google Wifi network. Your AT&T modem will purely be used as a modem and not a modem and router combination like it is currently, resolving the issue. If this causes signal coverage issues in your garage, you may need to look at investing in an additional Wifi point. If you do go down this route, it's important to review the guidance below.

Where to place your Wifi devices - Google Nest Help

One thing that's not explicitly stated is you should aim to place your primary Wifi point as close as possible to the centre of your home. That's because the Google Wifi and Nest Wifi mesh system uses a fewest hops approach. If one of your secondary points can get even a weak connection to your primary Wifi point, it will do that instead of going through an intermediary Wifi point that may physically be closer. That's why not installing them in a straight line, and placing your primary Wifi point close to the centre of your home really helps, along with all the other guidance in that article above.

Thank you David for your reply, but this is what I don't want to do, disable the ATT WiFi, as mentioned in my question. The Google network is already installed in the middle of the house, the mesh is working great and it gives great signal to the whole house... Except the garage 😭 this is why I want to keep the ATT wifi which right now allows those devices to connect to the Internet, but on the other hand, they are in a different network 😔

I was wondering if some IT expert have had a solution to make both routers (ATT & Google Pro) share the same network. I search up and down the Internet and I couldn't find an answer, the closest I got to is enabling AP but Google Wi-Fi pro will require each of the points to be hardwired so I'm back at step 1

David_K
Diamond Product Expert
Diamond Product Expert

The reason I suggested as above is because what you're asking for simply is not possible on a technical level. There is no way to do what you're asking I'm afraid.

You may have seen you can put Google Wifi in something called bridge mode (same idea as what AT&T call IP passthrough mode), however that's not only strongly not recommended as it disables many of its security features, but it's also only possible if you only have 1 Google Wifi device, and don't have multiple Google Wifi points to create a mesh Wifi network.

RickyGRockStar
Community Member

I thought that maybe there was a way by changing the range of IP addresses and disabling DHCP i could at least make the 2 routers work together to find each other devices in 1 network 😭