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We have yet (after more than ten years) to find a SOHO router where you couldn't do this: Have a read of the "Using two routers together" FAQ pinned in this forum. You can disregard the "Wi-Fi" aspects but as BobA51 says, all you should need to do is disable the DHCP Server and change the IP address to something that doesn't conflict with anything else in your network and you should be good to go.
The LAN ports in a SOHO router are an ethernet switch. All you have to do is render the routing and "IP" (including and especially DHCP) functionality of "old" router inactive and the FAQ describes how to achieve that. Then, plug it in, and you're good to go. Just read the first few posts of the aforementioned FAQ - you may even think it worthwhile to benefit from using "old" router as an additional Wi-Fi AP, though it's not mandatory - most SOHO router will let you turn Wi-Fi off. |
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