New Router: Insert into Old LAN, or Create New One?

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I seem to recall that some routers have the option to download all settings as a file to a computer. I am not 100% sure if Apple routers have this option (I think they do). If that is the case, and if you currently have an older version of Apple Airport Router, see if this works. After you upload the settings to the new router, you may need to make some changes, but most other stuff (SSID, passwords, any other rules you may have set up) should work.