How to setup WNR3500L as second router for seamless wireless network extension

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grillmaster77 wrote:

I have an xfinity cable modem as my primary router.

 

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Make and model?

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I have a WNR3500L connected to the main router

 

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An ancient (2009) device with less than startling wifi that can't hope to be "seamless". (That's what Mesh technology does.) But it could extend the wifi range.

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It seems it should be possible to do what I want. Any suggestions on what to try?

 

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It is called wireless access point (AP) mode. But your device seems to predate having that "built in" to the configuration, so it may not come with an easy "switch" to get it into AP mode in the browser graphical user interface (GUI). But you could try this:

How to turn an old Wi-Fi router into an access point - CNET  

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The problem is that devices connected to one router are invisible to devices connected to the other. For example, we have several devices that you can cast to, like Chromecasts, TVs, etc. However, because of the two networks, you can't always see the device you want to.

 

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Probably a consequence of "double NAT":

What is Double NAT? | Answer | NETGEAR Support

and

How to fix issues with Double NAT | Answer | NETGEAR Support